Infinite +1/+1 counters on a creatureInfinite colorless manaInfinite death triggersInfinite creature ETBInfinite creature LTBInfinite creature sacrifice triggers
How it works
Activate Ashnod's Altar by sacrificing Enduring Bondwarden, adding CC.
When Enduring Bondwarden dies, it and Athreos' third ability trigger.
Resolve the Enduring Bondwarden trigger, putting all counters from it onto another nontoken creature you control.
Resolve the Athreos trigger, returning Enduring Bondwarden from your graveyard to the battlefield.
When Enduring Bondwarden enters the battlefield, its backup ability triggers, putting a +1/+1 counter on the creature who had a coin counter placed on it, and giving it the printed ability until end of turn.
Activate Ashnod's Altar by sacrificing the nontoken creature with a coin counter on it, adding CC.
When the creature dies, it and Athreos' third ability trigger.
Resolve the creature's trigger, putting all counters from it onto Enduring Bondwarden .
Resolve the Athreos trigger, returning the creature from your graveyard to the battlefield.