Tarrian's Soulcleaver + Scurry Oak + Phyrexian Altar

Tarrian's Soulcleaver

Scurry Oak

Phyrexian Altar

How it works

1. Put a +1/+1 counter on Scurry Oak.
2. Scurry Oak triggers, creating a 1/1 Squirrel creature token.
3. Activate Phyrexian Altar by sacrificing the Squirrel, adding one mana of any color.
4. When the Squirrel dies, Tarrian's Soulcleaver triggers, putting a +1/+1 counter on Scurry Oak.
5. Repeat from step 2.

This clever loop thrives on the synergy between Scurry Oak and Tarrian's Soulcleaver, turning the humble death of a token into permanent growth. Whenever a +1/+1 counter lands on Scurry Oak, its triggered ability generates a 1/1 Squirrel creature token, which you can immediately feed to Phyrexian Altar to produce a mana of any color. That sacrifice sends the Squirrel to the graveyard, which in turn triggers Tarrian's Soulcleaver to place another +1/+1 counter back onto Scurry Oak, seamlessly restarting the cycle.