Ratadrabik of Urborg + Boonweaver Giant + On Serra's Wings + Yahenni, Undying Partisan

Ratadrabik of Urborg

Boonweaver Giant

On Serra's Wings

Yahenni, Undying Partisan

How it works

1. Activate Yahenni by sacrificing Boonweaver Giant.
2. When Boonweaver Giant dies as a legendary creature due to On Serra's Wings, Ratadrabik of Urborg triggers, creating a token copy of Boonweaver Giant that is a 2/2 Zombie in addition to its other types.
3. When the Boonweaver Giant token enters the battlefield, it triggers, returning On Serra's Wings from your graveyard to the battlefield attached to the token.
4. Resolve the Yahenni ability, giving it indestructible until end of turn.
5. Repeat.

This brilliant loop relies on **On Serra's Wings** to turn **Boonweaver Giant** into a legendary creature, which is the crucial secret that lets **Ratadrabik of Urborg** recognize the giant as a valid target for its zombie-copying trigger. Once the giant dies to **Yahenni, Undying Partisan**'s sacrifice ability, Ratadrabik steps in to replace it with a fresh 2/2 nonlegendary token copy. That newly arrived token immediately triggers its own enter-the-battlefield ability to fish **On Serra's Wings** right back out of the graveyard and attach itself anew, making the copy legendary all over again and ready to be fed right back to Yahenni for infinite sacrifices and triggers.