Princess Yue | Wormfang Turtle

Cards

Omni-Changeling in hand.
Princess Yue and
Wormfang Turtle on the battlefield (
Princess Yue is not a land).

Cast
Omni-Changeling by paying its mana cost. Choose to have it enter as a copy of
Princess Yue.
Put
Omni-Changeling into your graveyard due to the legend rule.
When
Omni-Changeling dies, it triggers, returning it from your graveyard to the battlefield as a land named Moon. Choose to have it enter as a copy of
Wormfang Turtle, gaining its abilities.
When
Omni-Changeling enters, its first ability triggers, exiling it.
When
Omni-Changeling leaves the battlefield, its second ability triggers, returning
Omni-Changeling from exile to the battlefield. Choose to have it enter as a copy of
Princess Yue.
Repeat from step 2.

This combo has been estimated to be Exhibition (Bracket 1+).