Athreos, Shroud-Veiled + Enduring Bondwarden + Phyrexian Altar

Prerequisites

• You control at least one other nontoken creature.
• Enduring Bondwarden has at least one coin counter on it.

Steps

1. 1Activate Phyrexian Altar by sacrificing Enduring Bondwarden, adding one mana of any color.
2. 2When Enduring Bondwarden dies, it and Athreos' third ability trigger.
3. 3Resolve the Enduring Bondwarden trigger, putting all counters from it onto another nontoken creature you control.
4. 4Resolve the Athreos trigger, returning Enduring Bondwarden from your graveyard to the battlefield.
5. 5When 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.
6. 6Activate Phyrexian Altar by sacrificing the nontoken creature with a coin counter on it, adding one mana of any color.
7. 7When the creature dies, it and Athreos' third ability trigger.
8. 8Resolve the creature's trigger, putting all counters from it onto Enduring Bondwarden .
9. 9Resolve the Athreos trigger, returning the creature from your graveyard to the battlefield.
10. 10Repeat.

Effects

• Infinite +1/+1 counters on a creature
• Infinite colored mana
• Infinite creature ETB
• Infinite creature LTB
• Infinite creature sacrifice triggers
• Infinite death triggers