Harbinger of Unfinished Death

Hexproof, Defender

Players can’t lose the game due to poison counters.

At the beginning of each end step, each opponent with one or more poison counters exiles the top X cards of their library, where X is the number of poison counters they have.

You may cast one nonland card exiled this way each turn and spend mana as though it were mana of any color.

“Death would be mercy. The mold wants more.”