Pattern of Rebirth + Mortuary + Boonweaver Giant + Umbral Collar Zealot

Pattern of Rebirth

Mortuary

Boonweaver Giant

Umbral Collar Zealot

How it works

1. Activate Umbral Collar Zealot by sacrificing Boonweaver Giant.
2. When Boonweaver Giant dies, Mortuary and Pattern of Rebirth trigger.
3. Resolve the Mortuary trigger, putting Boonweaver Giant on the bottom of your library from your graveyard.
4. Resolve the Pattern of Rebirth trigger, putting Boonweaver Giant from your library onto the battlefield.
5. When Boonweaver Giant enters the battlefield, it triggers, returning Pattern of Rebirth from your graveyard to the battlefield attached to Boonweaver Giant.
6. Resolve the Umbral Collar Zealot ability from step 1
7. Repeat.

This clever loop revolves around sacrificing Boonweaver Giant to Umbral Collar Zealot, which immediately triggers both Mortuary and Pattern of Rebirth. As Boonweaver Giant hits the graveyard, Mortuary places it right on top of your library while Pattern of Rebirth lets you search for and put that very same Boonweaver Giant back onto the battlefield. When the Giant re-enters, its own triggered ability fetches Pattern of Rebirth right back out of your graveyard to enchant it once more. Because Umbral Collar Zealot's ability also triggers its surveil along the way, you can easily sustain this cycle to generate an endless stream of sacrifice, death, and entry triggers.