Kirri, Talented Sprout + Waves of Aggression + Grand Warlord Radha

Kirri, Talented Sprout

Waves of Aggression

Grand Warlord Radha

How it works

1. Declare at least five creatures you control as attackers.
2. Grand Warlord Radha triggers, adding at least R/GR/GR/G.
3. At the beginning of your postcombat main phase, Kirri triggers, returning a land card from your graveyard to the battlefield.
4. Cast Waves of Aggression from your graveyard for its retrace cost by paying 3 and discarding a land card, causing you to untap all creatures that attacked this turn, and to get an additional combat and main phase after this one.
5. Repeat.

This engine relies on Grand Warlord Radha to fund our extra phases, generating a massive influx of red and green mana the moment our creatures are declared as attackers. To keep the loop going indefinitely, Waves of Aggression uses its retrace ability to be cast directly from the graveyard, allowing us to chain additional combats and main phases together. Kirri, Talented Sprout ensures we never run out of fodder for that retrace cost by constantly plucking land cards back from our graveyard into our hand during each postcombat main phase, turning a single discarded land into a closed loop of endless attacks.