Gishath, Sun's Avatar + Mortuary + Aggravated Assault + Phyrexian Altar

Gishath, Sun's Avatar

Mortuary

Aggravated Assault

Phyrexian Altar

How it works

1. Deal combat damage to an opponent using Gishath.
2. Gishath triggers, causing you to reveal the top seven cards of your library and put all Dinosaurs revealed this way onto the battlefield.
3. Move to your postcombat main phase.
4. Activate Phyrexian Altar five times by sacrificing five other nontoken Dinosaurs, adding 3.
5. When the Dinosaurs die, Mortuary triggers that many times, putting the Dinosaurs on top of your library from your graveyard.
6. Activate Aggravated Assault by paying 3, causing you to untap all creatures you control and to get an additional combat and main phase after this one.
7. Repeat.

This magnificent loop relies on Gishath, Sun's Avatar flooding the battlefield with an army of prehistoric beasts through its combat damage trigger, ensuring you have plenty of fodder for Phyrexian Altar. As you sacrifice those creatures to the Altar for mana, Mortuary quietly intercepts them on their way to the graveyard, stacking them right back onto the top of your library so Gishath's next charge can unearth them all over again. The mana generated from the sacrifice feeds directly into Aggravated Assault, allowing you to continually bypass the normal flow of phases and unleash endless combat steps.