Blossoming Tortoise + Dryad Arbor + Infinite Reflection + Altar of Dementia

Blossoming Tortoise

Dryad Arbor

Infinite Reflection

Altar of Dementia

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 Altar of Dementia by sacrificing Dryad Arbor, causing target player to mill cards equal to Dryad Arbor's power.
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 turns land drops into a self-sustaining engine by exploiting how clone effects interact with future permanents. Once Infinite Reflection transforms your future creatures into copies of Blossoming Tortoise, playing Dryad Arbor means it enters as a fresh Tortoise rather than a humble 1/1 land creature. Thanks to Altar of Dementia, you can immediately sacrifice this newly-minted Tortoise to mill a player before its entry trigger even resolves, milling three more cards and pulling the very same Dryad Arbor straight back from the graveyard to repeat the cycle endlessly.