Boonweaver Giant + Phyrexian Altar + Fool's Demise

Boonweaver Giant

Phyrexian Altar

Fool's Demise

How it works

1. Activate Phyrexian Altar by sacrificing Boonweaver Giant
2. When Boonweaver Giant dies, Fool's Demise's first and second ability triggers.
3. Resolve the first trigger, returning Boonweaver Giant from your graveyard to the battlefield
4. When Boonweaver Giant enters, it triggers, returning Fool's Demise from your graveyard to the battlefield attached to Boonweaver Giant.
5. Resolve the second Fool's Demise ability, doing nothing,.
6. Repeat.