Radagast, Wizard of Wilds + Temur Sabertooth + Phyrexian Altar + Sojourner's Companion + Doubling Season

Radagast, Wizard of Wilds

Temur Sabertooth

Phyrexian Altar

Sojourner's Companion

Doubling Season

How it works

1. Cast Sojourner's Companion by paying 0.
2. Radagast triggers, creating two 3/3 Beast creature tokens.
3. Activate Phyrexian Altar twice by sacrificing the Beasts, adding 1.
4. Activate Temur Sabertooth by paying 1, returning Sojourner's Companion from the battlefield to your hand.
5. Repeat.

This loop relies on the zero-mana cost of Sojourner's Companion, which you can cast for free thanks to its affinity for artifacts. Each time you cast it, Radagast, Wizard of Wilds triggers because the spell has a mana value of 5 or greater, and Doubling Season steps in to double those creations into two 3/3 Beast tokens instead of one. You then feed those tokens to Phyrexian Altar to generate the exact green and generic mana needed to activate Temur Sabertooth. Finally, Temur Sabertooth bounces Sojourner's Companion back to your hand, allowing you to replay the artifact and repeat the entire cycle for infinite creature entries, sacrifices, and storm count.