Hostility + Reiterate + Thud + Phyrexian Altar

Hostility

Reiterate

Thud

Phyrexian Altar

How it works

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 4, 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.
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 4, 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.

This ingenious loop turns a single heavy blow into an unstoppable cascade of fiery vengeance, fueled entirely by the brilliant synergy between Hostility, Reiterate, Thud, and Phyrexian Altar. When Thud launches a massive attack at an opponent, Hostility's replacement effect steps in to intercept the damage, trading it for an army of hasty Elemental Shaman tokens instead of just reducing a life total. Those newly created tokens are then immediately fed to Phyrexian Altar to generate the exact mana needed to pay for Reiterate's buyback cost, allowing you to copy Thud over and over again. Once you have built up an arbitrarily large horde of creatures and infinite colored mana, you can even sacrifice Hostility itself to the Altar so it shuffles back into your library, letting you finally point the copied Thud directly at an opponent's face to win the game.