Thresh

Nightfall: Grant me +1|+0 for each time we've activated Nightfall this game.

Play: Kill an ally to summon a random follower that costs 2 more.

Each round, the first time you slay a unit with a spell, summon an Ephemeral Mistwraith.

When another ally dies, drain 1 from the enemy Nexus.

When I'm summoned or Attack: Create a Darkness in hand if you don't have one. Your damage and kill spells accelerate to Fast.

When an ally dies, refill your spell mana.

Each round, the first time an ally dies, summon an Encroaching Mist.