Prowling Geistcatcher, Emiel the Blessed, and Ashnod's Altar

Prerequisites

• Prowling Geistcatcher on the battlefield
• Emiel the Blessed on the battlefield
• Ashnod's Altar on the battlefield
• You control at least two other nontoken creatures

Steps

1. Activate Ashnod's Altar twice by sacrificing two other nontoken creatures, adding
2. Prowling Geistcatcher triggers twice, exiling the sacrificed creatures from your graveyard
3. Activate Emiel by paying , blinking Prowling Geistcatcher
4. Prowling Geistcatcher leaves the battlefield, returning all creature cards exiled with it to the battlefield
5. Repeat

Results

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