Requires

Hostility must be on the battlefield. Reiterate must be in hand. Thud must be in hand. Phyrexian Altar must be on the battlefield. You control another creature with power seven or greater. Mana needed:

Steps

1. Cast Thud by paying and sacrificing a creature you control with power seven or greater.
2. Holding priority, cast Reiterate with buyback by paying , creating a copy of Thud and returning Reiterate to your hand.
3. Resolve the Thud copy, causing you to create at least seven 3/1 Elemental Shaman creature tokens with haste due to Hostility.
4. Activate Phyrexian Altar seven times by sacrificing seven Elemental Shamans, adding .
5. Repeat from step 2 an arbitrarily large number of times.
6. Activate Phyrexian Altar by sacrificing Hostility, adding .
7. Hostility dies, shuffling itself into your library from your graveyard.
8. Cast Reiterate with buyback by paying , creating a copy of Thud and returning Reiterate to your hand.
9. Resolve the Thud copy, dealing at least seven damage to any target.
10. Repeat from step 8.

Results