Lava Flow Dungeon

On your upkeep, add a doom counter to Lava
Flow Dungeon. When this card has 2 doom
counters on it, sacrifice a creature. Repeat this
process when there are 4 and 6 doom counters on
Lava Flow Dungeon. If you are unable to sacrifice
a creature, sacrifice this card instead.
{t}: Add {b}{b}{b} or {r}{r}{r}