THIS IS NOT A COMPETITIVE EDH DECK

Many times when I play Mono Blue in my play group, I feel that I am getting a lot of hate even though I don't even put any threat on the board. It got worse when I used Baral, Chief of Compliance as my Commander which draw a lot of hate. I decided to re-iterate my mono blue EDH completely, playing it with more creatures and permanents instead of resorting to counterspells. If there would be an archetype for this deck, I would consider it as a Mono Blue Devotion deck. However, the main goal of this deck is for me to play... what I consider are "classic" blue spells that I love.

Regarding the Ring of Evos Isle

You maybe wondering why I put Ring of Evos Isle on the mainboard instead of something like Lightning Greaves. Without a doubt, the Greaves is definitely the superior choice when playing the deck. However, I have a memorable memory with the Ring back during M12 Standard era. Therefore, this Ring is in the deck merely for the nostalgia purposes.

Pre Core Set 2020 (ver 1.1)

There are several winning conditions you have for this deck. However, it is not designed to appear consistently every time you play a game with you friends (because it is casual). 

1. You can just control your way through and bash your opponents with huge creatures and Thassa in the end. You can also sneak in a Master of Waves to steal a win.

2. Teferi, Mage of Zhalfir + Knowledge Pool for cast lockdown. Opponent's won't be able to cast any spells.

3. Vendilion Clique, Spell Crumple, Hinder, or Jace, the Mind Sculptor + Tunnel Vision for deck mill on a single opponent.

 Core Set 2020 Update (ver 1.2.1)

-Added Flood of Tears in the mainboard. Moved Inundate to Maybeboard. The addition of Flood of Tears is fairly easy because Flood of Tears into Omniscience is another win condition that we can have. Inundate, however, is also a good asset to the deck and should be considered playing. Which is why it is moved to the Maybeboard.

-Dungeon Geist added to Maybeboard. You can play the Geist instead of Icefall Regent for the cheaper mana cost. However, I prefer the Regent simply because it is a dragon.

-Added Mu Yanling, Sky Dancer to the mainboard. Removed Sphinx of Uthuun. The Sphinx is honestly great, but looking at the mana curve, I feel that I need to move it down a bit.

-Added Agent of Treachery to maybeboard. If this deck is going more towards stealing people's stuff, you may consider playing this card. It is a cool card.

Throne of Eldraine Update (ver 1.3.1)

-Removed Mu Yanling, Sky Dancer the card doesn't work on EDH. Added Brazen Borrower to mainboard.

-Added Gadwick, the Wizened to Mainboard. Gadwick is suprisingly a very good card. I am surprised on its performance in the standard metagame. Furthermore, it is a 3 devotion permanent which synergises well with the deck. Removed Recurring Insight from Mainboard, added to Maybeboard. Reason is to increase the frequency of permanent instead of relying on instants or sorceries.

-Added Midnight Clock. It is a blue Mana Rock with a great ability if it hits 12 counter. Why not? It is a great addition to the deck. Removed an Island.

-Added The Magic Mirror to Mainboard. This card is made for EDH, it is a very strong artifact and it contributed 3 devotion to Thassa. Removed Scourge of Fleets. It is a heavy card to cast, one that I rather not play.

Some thoughts to take into considerations in the future: Since this mono blue deck is devotion based, yet there is still that desire to run it as a control, it might be wise to consider high devotion non-creature permanents instead. It could serve useful. Throne of Eldraine provided excellent blue permanent that are non-creature.

Theros Beyond Death Update (ver 1.4)

- Added Thassa, Deep-Dwelling to Mainboard. Removed Conjurer's Closet. An obvious choice. Costs one less, is indestructible, contributes to a devotion and it produces the same effect. Also it has control-ish property as its activated ability.

-Added Thassa's Oracle to Mainboard. Removed Preordain. Just in general, much better synergy with the deck.

-Added Thryx, the Sudden Storm to Mainboard. My god... I love this card. It made all high mana cost creatures played in this deck much more viable. Furthermore, it can be played at instant speed. Removed Brazen Borrower, moved to Maybeboard. The card requires further testing.

-Added Nadir Kraken to Maybeboard. A solid 3 mana creature which can be pumped stronger. It also provides 2 points of devotion.

Theros Beyond Death Additional Update (ver 1.4.2)

-Added Callaphe, Beloved of the Sea into Maybeboard. This card is rather interesting because it benefits from devotion. I am considering to remove Kira for this, but there is a need for testing.

-Added Altar of the Pantheon to Mainboard. It's a synergystic mana rock that is essentially 1 devotion. Similar to Midnight Clock here. Removed an Island for this.

-Added Nyx Lotus to Mainboard. I do think this card still requires testing in terms of consistency, benefit and speed. However, I do believe that it is slightly better than Sky Diamond.

-Added Force of Will to mainboard, removed Cryptic Command. Cryptic Command's mana cost is way to restrictive to play properly.

-Removed Knowledge Pool. The reason why I played the card was for a lockdown on the board with Teferi. However, everytime I play Knowledge Pool, the game dragged on and it becomes very exhausting and unenjoyable. Added Disciple of the Ring as a replacement. It is an ok card, but it counters spell and gives some functionality to the graveyard. It's fun to play too.

-Added Thassa's Intervention to mainboard for the flavor. Removed Ring of Evos Isle.

-Removed Marit Lage's Slumber. It's way too slow for memes. Also a reason for me to stop using snow-covered lands and start putting in the Theros's land. Additionally, added Harbinger of the Tides to mainboard. A flash creature in a sense and it is a form of temporary removal for massive threats (I just got beaten by a Marit Lage). It is also a 2 devotion creature.

Ikoria, Zendikar Rising, Kaldheim, Strixhaven, MH2 & Dungeons n Dragons Update (ver 1.5)

- Added Voracious Greatshark to mainboard. A counterspell with a board that comes in with a flash, and 2 devotions. This is a good card. I removed Bribery because it's a salt card and I am getting a lot of complaints in my playgroup.

- Added Sea Gate Restoration to mainboard. It's just a straight up powerful card, and card draw is always welcomed in the deck. It can even turn into a land if you desperately need one in the early game. Removed Thassa's Oracle, just because it's practically hated now and I don't really want the card in my deck due to personal preference.

- I have given it a thought on whether I want Kefnet in my deck or otherwise. Most of the time he serves as a 4/5 flyer with 2 devotions which is great but it's ability does not serve any purpose. This is why I decided to put Orvar, the All-Form inside instead as an extra layer of protection and removed God-Eternal Kefnet.

- Addded Tempted by the Oriq to maybeboard. My god this card is strong. If only it targets all permanent... 

- Added Solve the Equation to maybeboard. It's a tutor, I need to put it in for future reference.

- Added Demilich to mainboard. IT'S A 4 MANA 4 DEVOTION. Like it doesn't even matter if you can cast it at a discounted cost I guess, a turn 3 Thassa into turn 4 Demilich would mean an activated god. This is before taking into account the amazing ability it has. Graveyard recursion is great! Removed Nyx Lotus. Nyx Lotus is a little too slow, even though it's a great card.

- Added Mordenkainen to mainboard. It's a new planeswalker, why not? He seemed to be quite solid and a dog with the power of Osiris is great! With that in mind, removed Karn Liberated. Sure, Karn is Karn, but honestly most of the time it just became a flexed card without a real substance to the board.

- Added Iymrith, Desert Doom to mainboard. More dragons means better. Always love the blue dragons due to their ward abilities. This card is pretty good too, acting as a solid defender and could potentially attack to give you more cards when needed. Removed Aetherling, Aetherling was kind of a sentimental value to me because it won me my first draft. However, it is mediocre in EDH.