Arahbo, the First Fang + Whitemane Lion + Phyrexian Altar + Doubling Season

Arahbo, the First Fang

Whitemane Lion

Phyrexian Altar

Doubling Season

How it works

1. Cast Whitemane Lion by paying 1.
2. When Whitemane Lion enters the battlefield, it and Arahbo trigger.
3. Resolve the Whitemane Lion trigger, returning it from the battlefield to your hand.
4. Resolve the Arahbo trigger, creating two 1/1 Cat creature tokens.
5. Activate Phyrexian Altar twice by sacrificing the Cats, adding 1.
6. Repeat.

This elegant self-sustaining loop relies on Whitemane Lion's clever ability to return itself to your hand upon entering the battlefield, which conveniently satisfies the requirement to bounce a creature while resetting the process. Meanwhile, Arahbo, the First Fang acts as our token factory, and thanks to Doubling Season's static replacement effect, every time Arahbo's trigger resolves it floods the board with twice as many 1/1 Cat tokens. Those freshly minted tokens are then immediately fed into Phyrexian Altar to generate the exact mana needed to recast the Lion, funding the loop indefinitely while harvesting infinite sacrifices and death triggers.