Toph, the First Metalbender + Biotransference + Sylvan Safekeeper

Toph, the First Metalbender

Biotransference

Sylvan Safekeeper

How it works

1. Cast the earthbending creature by paying its mana cost.
2. When you cast that spell, you lose 1 life and create a 2/2 artifact creature token.
3. The earthbending creature enters as an artifact land creature due to Biotransference and Toph.
4. When that creature enters, it earthbends, causing itself to become a land creature with haste, putting at least one +1/+1 counter on itself, and creating a delayed triggered ability.
5. Activate Sylvan Safekeeper by sacrificing that creature.
6. When that creature dies, the delayed ability from step 4 triggers, causing it to return to the battlefield tapped as an artifact land creature.
7. Repeat from step 3 any number of times.
8. Resolve all activated abilities from Sylvan Safekeeper.