Soul of Windgrace + Waves of Aggression + Grand Warlord Radha

Soul of Windgrace

Waves of Aggression

Grand Warlord Radha

How it works

1. Declare Grand Warlord Radha, Soul of Windgrace and at least three other creatures as attackers.
2. Grand Warlord Radha and Soul of Windgrace trigger.
3. Resolve the Grand Warlord Radha trigger, adding at least R/GR/GR/G.
4. Resolve the Soul of Windgrace trigger, returning a land card from your graveyard to the battlefield tapped.
5. Move to your postcombat main phase.
6. 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.
7. Repeat.

This loop relies on Grand Warlord Radha and your attacking army to generate a flood of mana whenever attackers are declared, while Soul of Windgrace uses its attack trigger to recycle lands straight from the graveyard back onto the battlefield. That newly returned land becomes essential ammunition to cast Waves of Aggression right back out of your graveyard using its retrace ability. With Waves of Aggression untapping all your attackers and granting you an additional combat phase, you can simply repeat the entire cycle indefinitely for infinite combat steps and boundless red and green mana.