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Lavabrink Floodgates 
Artifact
Ikoria Commander Rare
: Add 
.At the beginning of each player's upkeep, that player may put a doom counter on Lavabrink Floodgates or remove a doom counter from it. Then if it has three or more doom counters on it, sacrifice Lavabrink Floodgates. When you do, it deals 6 damage to each creature.
#53 — Illus. Anastasia Ovchinnikova