Pattern of Rebirth + Mortuary + Boonweaver Giant + Phyrexian Altar

Pattern of Rebirth

Mortuary

Boonweaver Giant

Phyrexian Altar

How it works

1. Activate Phyrexian Altar by sacrificing Boonweaver Giant, adding one mana of any color.
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. Repeat.