Koll, the Forgemaster + Diamond Lion + Samut, Voice of Dissent + Ronin Warclub

Koll, the Forgemaster

Diamond Lion

Samut, Voice of Dissent

Ronin Warclub

How it works

1. Cast Diamond Lion by paying 2.
2. When Diamond Lion enters, Ronin Warclub triggers, attaching itself to Diamond Lion.
3. Activate Diamond Lion by tapping it, sacrificing it and discarding your hand, adding three mana of any color.
4. When Diamond Lion dies, Koll triggers, returning Diamond Lion from your graveyard to your hand.
5. Repeat.

This looping engine turns a humble mana-rock cat into a self-sustaining mana fountain by exploiting the automatic attachment of Ronin Warclub. Whenever Diamond Lion enters the battlefield, the Equipment naturally jumps onto it, satisfying Koll, the Forgemaster's requirement that the creature be equipped when it dies. When you sacrifice Diamond Lion to net three mana, Koll immediately returns it to your hand so you can replay it, while Samut, Voice of Dissent waits quietly in the wings (though her haste and untap prowess are nice, here the loop operates entirely through the recursive synergy of the other three pieces).