Prowling Geistcatcher + Felidar Guardian + Ashnod's Altar
Prowling Geistcatcher
Felidar Guardian
Ashnod's Altar
Requires
Prowling Geistcatcher must be on the battlefield.
Felidar Guardian must be in hand.
Ashnod's Altar must be on the battlefield.
Mana needed: 
Steps
- Cast Felidar Guardian by paying .
- Felidar Guardian enters the battlefield, triggering its ability, targeting Prowling Geistcatcher.
- Holding priority, activate Ashnod's Altar by sacrificing Felidar Guardian, adding .
- Prowling Geistcatcher triggers, exiling Felidar Guardian from your graveyard.
- Resolve the Felidar Guardian trigger from 2, blinking Prowling Geistcatcher.
- Prowling Geistcatcher leaves the battlefield, returning Felidar Guardian from exile to the battlefield.
- Repeat from step 2.
Results
Infinite blinking. Infinite colorless mana. Infinite death triggers. Infinite ETB. Infinite LTB. Infinite sacrifice triggers.
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