Narchan, Demon-Touched

Corruption {1}{u}{b}{t}({1}{u}{b}{t} put a corruption counter on target creature. It gains +X-X, where X is the amount of corruption counters on the battlefield in total.
When this creature dies, you gain X life)
When Narchan, Demon-Touched becomes tapped,
deal X damage to any target
"With great pain comes greater knowledge. With great power comes greater sacrifice."