Athreos, Shroud-Veiled + Enduring Bondwarden + Altar of Dementia

Prerequisites

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

Steps

1. 1Activate Altar of Dementia by sacrificing Enduring Bondwarden.
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. 6Resolve the Altar of Dementia ability from step 1, causing target player to mill cards equal to Enduring Bondwarden's power.
7. 7Activate Altar of Dementia by sacrificing the nontoken creature with a coin counter on it.
8. 8When the creature dies, it and Athreos' third ability trigger.
9. 9Resolve the creature's trigger, putting all counters from it onto Enduring Bondwarden .
10. 10Resolve the Athreos trigger, returning the creature from your graveyard to the battlefield.
11. 11Resolve the Altar of Dementia ability from step 7, causing target player to mill cards equal to the sacrificed creature's power.
12. 12Repeat.

Effects

• Infinite +1/+1 counters on a creature
• Infinite creature ETB
• Infinite creature LTB
• Infinite creature sacrifice triggers
• Infinite death triggers
• Infinite mill
• Infinite self-mill