Zimud, Life Razer

Flying, Ingest, Wither, Indestructible, Annihilator Y, Afflict Y, Devour X
Zimud, Life Razer enters the battlefield with X Doom Counters.
At the beginning of your upkeep, put a Doom counter onto Zimud, Life Razer.
Zimud, Life Razer has +Y/+Y.
Y is equal to the number of Doom counters on Zimud, Life Razer.