snake commander deck mtg Sea Monsters | Koma EDH gameplay What cards to include in

This is what I'd call a Group Slug ability, where the goal is to hurt the entire table quickly

Is that good enough for taking the turn off

Use the creature's mana value as it last existed on the battlefield to determine how much life its controller gains

Illuminor SzerasIlluminor Szeras sacrifices creatures to make mana, which can help you get to some of the awesome high cost cards in the deck a bit sooner, but may stumble if you can't find card advantage to make up for the things you're sacrificing and ramping out

This list is going to be heavily slanted towards Commander, but I will talk about other formats and relevant cards where I can