Activate Phyrexian Altar by sacrificing Howlgeist, adding {B}.
Howlgeist dies, triggering its undying ability, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
Activate Retribution of the Ancients by paying {B} and removing a +1/+1 counter from Howlgeist, giving any creature -1/-1 until end of turn.
Repeat.

Infinite death triggers

Infinite ETB

Infinite LTB

Infinite sacrifice triggers

Reduce any number of target creatures' toughness to zero

Retribution of the Ancients

Phyrexian Altar

Howlgeist

Activate Kykar by sacrificing Howlgeist, adding {R}.
Howlgeist dies, triggering its undying ability, returning it from your graveyard to the batltefield without a +1/+1 counter on it due to Solemnity.
Repeat.

Infinite red mana

Kykar, Wind's Fury

Solemnity

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