Tidespout Tyrant + Mana Crypt

Tidespout Tyrant

Mana Crypt

How it works

1. Cast Mana Crypt by paying its mana cost.
2. Tidespout Tyrant triggers, returning a nontoken permanent that can be cast using CC from the battlefield to your hand.
3. Activate Mana Crypt by tapping it, adding CC.
4. Cast the nontoken permanent returned in step 2 by paying its mana cost.
5. Tidespout Tyrant triggers, returning Mana Crypt from the battlefield to your hand.
6. Repeat.