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

Radagast, Wizard of Wilds

Temur Sabertooth

Phyrexian Altar

Sojourner's Companion

Tangleroot

How it works

1. Cast Sojourner's Companion by paying 0.
2. Radagast and Tangleroot trigger.
3. Resolve the Tangleroot trigger, adding .
4. Resolve the Radagast trigger, creating a 3/3 Beast creature token.
5. Activate Phyrexian Altar by sacrificing the Beast, adding 1.
6. Activate Temur Sabertooth by paying 1, returning Sojourner's Companion from the battlefield to your hand.
7. Repeat.

This brilliant engine exploits the zero-mana artifact cost of Sojourner's Companion to fuel a continuous loop of creature casts and sacrifices. Every time you cast Sojourner's Companion for free, Tangleroot provides the green mana needed to activate Temur Sabertooth, which bounces the artifact creature right back to your hand. Meanwhile, Radagast, Wizard of Wilds takes notice of the high-mana-value spell and churns out a Beast token, which you can immediately sacrifice to Phyrexian Altar to generate the generic mana required for Temur Sabertooth's activation.