Rite of Finality

Magecraft —Whenever you cast or copy an
instant or sorcery spell, put a blood counter on
Rite of Finality and you lose 1 life.
At the beginning of your end step, if Rite of
Finality has exactly thirteen blood counters on it, sacrifice it. If you do, each opponent loses 13 life.
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The price of power is steep, and a grudge is even more.