Seeker of Ultimate Evil

At the beginning of your end step, you get an evil counter.
At the beginning of your upkeep, choose one. X
is equal to the number of evil counters you have.
•You draw X cards and lose X life.
•Target creature gets -X/-X until end of turn and
you gain X life.
•Until end of turn, Seeker of Ultimate Evil
becomes a demon, gets +X/+0, and gains flying, trample, and indestructible.