Arahbo, the First Fang + Whitemane Lion + Phyrexian Altar + Adrix and Nev, Twincasters

Arahbo, the First Fang

Whitemane Lion

Phyrexian Altar

Adrix and Nev, Twincasters

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 clever feline loop relies on Whitemane Lion returning itself to your hand upon entry, perfectly refunding its casting cost with mana generated by sacrificing the tokens it leaves behind. Arahbo, the First Fang provides the engine by flooding the board with Cat tokens whenever it or another nontoken Cat enters the battlefield, which is further amplified by Adrix and Nev, Twincasters doubling your token production. Finally, Phyrexian Altar acts as the sacrifice outlet that converts those multiplied tokens into the exact white mana needed to replay the Lion, turning a single cast into an infinite cycle of sacrifices and triggers.