Miirym, Sentinel Wyrm + Changeling Hero

Prerequisites

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Steps

1. 1Cast Changeling Hero by paying its mana cost.
2. 2When Changeling Hero enters, its champion ability and Miirym trigger.
3. 3Resolve the Miirym trigger, creating a token copy of Changeling Hero.
4. 4When the Changeling Hero token enters, its champion ability triggers, exiling the nontoken Changeling Hero until the token Changeling Hero leaves the battlefield.
5. 5Resolve the Changeling Hero trigger from step 2, exiling the token Changeling Hero.
6. 6The token Changeling Hero leaves the battlefield, returning the nontoken Changeling Hero from exile to the battlefield.
7. 7Repeat from step 2.

Effects

• Infinite creature ETB
• Infinite creature LTB