Agrus Kos, Eternal Soldier + Soulbright Flamekin + Deflecting Swat + Felidar Guardian + Scrivener

Agrus Kos, Eternal Soldier

Soulbright Flamekin

Deflecting Swat

Felidar Guardian

Scrivener

How it works

1. Activate Soulbright Flamekin by paying 2, targeting Agrus Kos.
2. Agrus Kos triggers, causing you to pay 1R/W to copy Soulbright Flamekin's ability targeting each other creature you control.
3. Resolve all Soulbright Flamekin triggers, giving the targeted creatures trample until end of turn and adding eight .
4. Cast Felidar Guardian by paying 3.
5. When Felidar Guardian enters the battlefield, it triggers, targeting Agrus Kos.
6. Agrus Kos triggers, causing you to pay 1R/W to copy Felidar Guardian's trigger, targeting each other creature you control except Felidar Guardian.
7. Resolve the copies of Felidar Guardian's trigger targeting Soulbright Flamekin and Scrivener, blinking Soulbright Flamekin and Scrivener.
8. When Scrivener enters the battlefield, it triggers, returning Deflecting Swat from your graveyard to your hand.
9. Holding priority, activate Soulbright Flamekin by paying 2, targeting Agrus Kos.
10. Agrus Kos triggers, causing you to pay 1R/W to copy Soulbright Flamekin's ability targeting each other creature you control.
11. Resolve all Soulbright Flamekin triggers, giving the targeted creatures trample until end of turn and adding eight .
12. Cast Deflecting Swat by paying 0, changing any of the remaining Felidar Guardian triggers not targeting Agrus Kos to target Agrus Kos instead.
13. Repeat from step 6.

This dazzling loop centers on Agrus Kos, Eternal Soldier, whose ability to copy targeted spells and abilities across your entire board turns a single activation into a massive ripple effect. When you target Agrus Kos with Soulbright Flamekin, Agrus Kos multiplies that targeting so that the third resolution yields a massive windfall of eight red mana. Meanwhile, Felidar Guardian and Scrivener enter the battlefield repeatedly to blink your creatures and recycle spells, with Scrivener specifically pulling Deflecting Swat back from your graveyard to hand. Because Deflecting Swat can be cast for zero mana thanks to its alternative cost, you can use it to redirect your extra Felidar Guardian triggers right back onto Agrus Kos, keeping the cascade of blinks, mana, and recursion flowing infinitely.