Blossoming Tortoise + Dryad Arbor + Infinite Reflection + Ashnod's Altar

Blossoming Tortoise

Dryad Arbor

Infinite Reflection

Ashnod's Altar

How it works

1. Play Dryad Arbor.
2. When Dryad Arbor enters the battlefield as a copy of Blossoming Tortoise due to Infinite Reflection, it triggers.
3. Holding priority, activate Ashnod's Altar by sacrificing Dryad Arbor, adding CC.
4. Resolve the Dryad Arbor trigger from step 2, causing you to mill three cards and return Dryad Arbor from your graveyard to the battlefield.
5. Repeat from step 2.

This clever loop hinges on Infinite Reflection ensuring that any incoming nontoken creature—including the land-creature Dryad Arbor—enters the battlefield as a direct copy of Blossoming Tortoise. Because that copy of Blossoming Tortoise triggers its own enter-the-battlefield ability, you can mill three cards and immediately return the fallen Dryad Arbor straight from your graveyard to the battlefield tapped. Before that resolution finishes, Ashnod's Altar steps in to sacrifice that very same Dryad Arbor for a pair of colorless mana, fueling a continuous cycle of rebirth, sacrifice, and endless colorless mana.