Princess Yue | Wormfang Turtle

Cards

Dack's Duplicate in hand.
Princess Yue and
Wormfang Turtle on the battlefield (
Princess Yue is not a land).

Cast
Dack's Duplicate by paying its mana cost. Choose to have it enter as a copy of
Princess Yue.
Put
Dack's Duplicate into your graveyard due to the legend rule.
When
Dack's Duplicate 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
Dack's Duplicate enters, its first ability triggers, exiling it.
When
Dack's Duplicate leaves the battlefield, its second ability triggers, returning
Dack's Duplicate from exile to the battlefield. Choose to have it enter as a copy of
Princess Yue.
Repeat from step 2.