Ekzykes, Decaying Revenger

This spell costs {1} less to cast for each nontoken creature
not named Ekzykes that died this turn.

Flying, wither, toxic 3

Whenever another creature you control dies, surveil 1, then you may draw a card. If you do, you lose 1 life.

{1}{b}{g}, {t}: Put a -1/-1 counter on up to X other target creatures, where X is the number of poison counters among all players.