Mainboard

Planeswalkers

The main top-end for the deck is the new Liliana. For 6 mana it's quite easy to get her out consistently on turn 4-5 at which point she demands immediate removal. Her 2/2 tokens serve as blockers to protect her and when they die you'll draw cards. Don't be afraid to use her -4 when you drop her if your opponent is playing midrange.

These are our two support planeswalkers. They both have quite a bit of incidental life gain which against aggro can be a game ender. Playing an Ajani, the Greathearted on turn 3 against mono-red is often the same as gaining 9 life. You can use his -2 to put +1/+1 counters on your incubation druids as well as boosting Liliana, Dreadhorde General one turn closer to her ult. Sorin, Vengeful Bloodlord, on the other hand, can be used both as life gain against mono-red and as creature recursion against midrange and control.

Creatures

Oketra is an amazing card for this deck because with him on the field every mana dork you cast will also spawn a 4/4 with vigilance. In conjunction with Liliana, Dreadhorde General this is often an instant game-ender. 

A great all-around midrange card. With Liliana, Dreadhorde General on the field, this turns into 3 new cards, and the tokens can be used for the -4 sacrifice ability.

Tolsimir is one of the best additions to midrange Selesnya colors in War of the Spark. Five mana for two 3/3 creatures, you gain 3 life, and you can have one of the 3/3 creatures fight an opponent's creature. Against aggro it can be used as flat out removal for any of their creatures, and against midrange and control it serves as two 3/3 bodies on the board. Alongside Liliana, Dreadhorde General it also acts as 2 card draw.

Not much to be said, it serves as enchantment and artifact removal as well as more life gain against aggro, and with Liliana, Dreadhorde General the normal downside of a 2/1 for three mana is largely irrelevant.

Mana Dorks

Llanowar Elves, Incubation Druid, Paradise Druid, and Leyline Prowler

War of the Spark brought with it two new mana generating creatures, both of which are proving highly effective. Paradise druid is immune to the early game removal that's so frequently used on mana dorks, and leyline prowler is useful as both a lifelinking blocker against aggro and a deathtouch blocker against midrange. Making it a lot easier to stall until you have the mana for Liliana, Dreadhorde General.

Instants

Despark, Vraska's Contempt, Settle the Wreckage

These three removal spells are for midrange matchups. If you're playing best of three they should be sideboarded out.

Mortify

I found that the prevalence of mono-red with experimental frenzy as well as other annoying enchantments warranted at least 1 copy of Mortify in the mainboard, another option might be a copy of Oath of Kaya instead. Feel free to experiment and see which works best for you.

Unbreakable Formation

A single copy of Unbreakable Formation in the mainboard to prevent board wipes.

Changelog

5/6/2019 - Removed 1 Llanowar Elf, Added 1 Mortify

5/12/2019 - Removed 1 Moment of Craving and 1 Settle the Wreckage from the sideboard, Added 2 Mortify to the sideboard

5/22/2019 - Removed 1 Leyline Prowler, Added 1 Llanowar Elf