Prowling Geistcatcher, Restoration Angel, and Ashnod's Altar

Prerequisites

• Prowling Geistcatcher on the battlefield
• Restoration Angel in hand
• Ashnod's Altar on the battlefield
• available

Steps

1. Cast Restoration Angel by paying
2. Restoration Angel enters the battlefield, triggering its ability, targeting Prowling Geistcatcher
3. Holding priority, activate Ashnod's Altar by sacrificing Restoration Angel, adding
4. Prowling Geistcatcher triggers, exiling Restoration Angel from your graveyard
5. Resolve the Restoration Angel trigger from 2, blinking Prowling Geistcatcher
6. Prowling Geistcatcher leaves the battlefield, returning Restoration Angel from exile to the battlefield
7. Repeat from step 2

Results

• Infinite blinking
• Infinite colorless mana
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers