Activate Ashnod's Altar by sacrificing the undying creature, adding {C}{C}.
When the creature dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
Activate Hexavus' second ability by paying {1} and removing the +1/+1 counter from the undying creature, putting a +1/+1 counter on Hexavus.
Repeat.

Infinite creature LTB

Infinite creature ETB

Infinite creature sacrifice triggers

Infinite death triggers

Infinite colorless mana

Infinite +1/+1 counters on a creature

Undying Creature

Hexavus

Ashnod's Altar

Activate Phyrexian Altar by sacrificing the undying creature, adding {B}.
When the undying creature dies, its undying ability triggers, 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 the undying creature, giving any creature -1/-1 until end of turn.
Repeat.

Reduce the toughness of creatures opponents control to 0

Retribution of the Ancients

Phyrexian Altar

Activate Ashnod's Altar by sacrificing The Master, adding {C}{C}.
When The Master dies, if it was a copy of the undying creature, its undying ability triggers, returning it from your graveyard to the battlefield as a copy of the persist creature with a +1/+1 counter on it.
Otherwise, if The Master was a copy of the persist creature, its persist ability triggers, returning it from your graveyard to the battlefield as a copy of the undying creature with a -1/-1 counter on it.
Repeat.

Persist Creature

The Master, Formed Anew

Activate Ashnod's Altar by sacrificing the Undying creature, adding {C}{C}.
When the creature dies, its Undying ability triggers, returning it from your graveyard to the battlefield.
When the creature enters the battlefield, Denry triggers, putting a -1/-1 counter on it.
Remove the -1/-1 and the +1/+1 counter from the Undying creature as a state-based action.
Repeat.
Note that this combo has additional results depending on the Undying creature.

Denry Klin, Editor in Chief

Activate Ashnod's Altar by sacrificing the undying creature, adding {C}{C}.
When the undying creature dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
Activate Korozda Gorgon by paying {2} and removing the +1/+1 counter from the undying creature, targeting any creature.
Holding priority, repeat from step 1.
Resolve all Korozda Gorgon abilities.

Korozda Gorgon

Donate Blightbeetle to an opponent
Activate Phyrexian Altar by sacrificing the undying creature.
When the undying creature dies, its undying ability triggers, returning itself from your graveyard to the battlefield without a +1/+1 counter on it due to Blightbeetle.
Repeat from step 2.

Infinite colored mana

Blightbeetle

Fateful Handoff

Activate the creature with undying by tapping and sacrificing it, adding {3}.
When the creature dies, Solemnity triggers, returning it from your graveyard to the battlefield without a +1/+1 counter on it.
Activate Lotus Ring's equip ability by paying {3}, attaching it to the undying creature.
Repeat.

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