Radagast, Wizard of Wilds + Temur Sabertooth + Phyrexian Altar + Sojourner's Companion + Primal Vigor

Radagast, Wizard of Wilds

Temur Sabertooth

Phyrexian Altar

Sojourner's Companion

Primal Vigor

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 ingenious loop turns the low-cost artifact artifact-creature Sojourner's Companion into an infinite engine by leveraging the mana-generating sacrifice outlet Phyrexian Altar and the self-bounce capabilities of Temur Sabertooth. Because Primal Vigor doubles the token output whenever you cast a spell with a mana value of 5 or greater, casting your Companion triggers Radagast, Wizard of Wilds to flood the board with a surplus of 3/3 Beasts. You then feed those generated tokens directly into Phyrexian Altar to fund the exact mana cost needed for Temur Sabertooth to bounce Sojourner's Companion right back to your hand, resetting the loop for zero net mana and generating infinite storm count, sacrifices, and entry triggers along the way.