Merciless Executioner enters the battlefield, it triggers.
Holding priority, activate
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Relic of Legends' second ability by tapping
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Burakos, adding ({B} magic symbol) .
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Burakos triggers, giving it and all creatures you control that share a creature type with it +2/+0 and undying until end of turn.
Resolve the
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Merciless Executioner trigger from step 2, causing you to sacrifice
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Burakos, and each opponent to sacrifice a creature.
When
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Burakos dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
Activate
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Retribution of the Ancients by paying ({B} magic symbol) and removing the +1/+1 counter from
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Burakos, giving
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Merciless Executioner -1/-1 until end of turn.
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Merciless Executioner dies as a state-based action due to having 0 toughness, triggering its undying ability, returning it from your graveyard to the battlefield with a +1/+1 counter from it.
Repeat steps 2 through 6 one additional time.
Activate
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Retribution of the Ancients by paying ({B} magic symbol) and removing the +1/+1 counter from
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Burakos and
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Merciless Executioner, giving
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Merciless Executioner -2/-2 until end of turn.
Repeat from step 8.
Results
Each opponent sacrifices all creatures they control.
Infinite death triggers.
Infinite ETB.
Infinite LTB.
Infinitely powerful Orcs, Wizards, Warriors, Rogues, and Clerics except