|Instant, Sorcery, Enchantment, Artifact (16)|
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My take on a mono-U Merfolk tempo deck. This is a tribal deck, so the Lords are our bread and butter. Lord of Atlantis and Master of the Pearl Trident are the bedrock this deck is built on, so we pack the full playset of each. In order to ensure my guys get through, I am packing an islandwalk-enabling mechanism in Spreading Seas, which doubles as disruption for decks that don't use blue mana. Furthermore, the deck features tapdown effects to clear blockers or deter attackers in Merfolk Trickster. This makes this deck very tough to block, which in turn means that no life total is safe.
Of course, I fully expect my creatures to get disrupted or the board state to stall out on occasion, so I've made a couple of adjustments to deal with that. Silvergill Adept and Benthic Biomancer give the deck lots of churn to make sure that everything goes smoothly, Force of Negation is a powerful counterspell that can be used to protect my team or disrupt my opponent (and can be potentially cast for free if need be), Mutavault can weaponize excess mana and is resilient to sorcery-speed removal, and Master of Waves brings a powerful army-in-a-can effect that can be leveraged on offense or defense. Because the current metagame is very heavily skewed towards graveyard decks, I am maindecking a hate piece that can be cycled away in a pinch in Relic of Progenitus.
The sideboard is geared toward both addressing tough matchups and reinforcing strong ones. Deprive is a strong catchall counterspell that comes in to combat anything from Burn to Amulet Titan to UW Control, whereas Echoing Truth is a nice piece of catchall bounce that can address anything from artifacts (Ensnaring Bridge), to enchantments (Worship), to token swarms (like the ones produced by Empty the Warrens), to multiples of big, scary creatures (Death's Shadow and Gurmag Angler). Speaking of catchalls, Phyrexian Revoker is a handy piece of interaction that can shut down activated abilities on any nonland permanent and can be Vialed in to devastating effect. Venser, Shaper Savant is yet another catchall that provides a handy bounce effect that can interact with your opponent in ways few (if any) cards can. Last but not least, we have Dismember as a bit of emergency creature removal and Ashiok, Dream Render as a way to stymie tutors and graveyards alike.