When Deep Forest Hermit enters the battlefield, it triggers, creating eight 1/1 Squirrel creature tokens.
Activate Phyrexian Altar seven times by sacrificing seven Squirrels, adding 4.
Activate Temur Sabertooth by paying 1, returning Deep Forest Hermit to your hand from the battlefield.
Repeat.
This delightful engine relies on a brilliant math multiplier: with Adrix and Nev, Twincasters passively doubling your token generation, every instance of Deep Forest Hermit entering the battlefield floods you with eight Squirrels instead of the usual four. You then feed seven of those newly minted tokens to Phyrexian Altar to generate the exact mana needed to recast the Hermit, keeping a surplus of mana and Squirrels with every single loop. Finally, Temur Sabertooth serves as the crucial safety net, allowing you to bounce the Deep Forest Hermit back to your hand for a modest investment so you can replay the whole cycle anew.