Prowling Geistcatcher + Kiki-Jiki, Mirror Breaker + Ashnod's Altar

Prerequisites

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Steps

1. 1Activate Kiki-Jiki by tapping it, creating a token copy of Prowling Geistcatcher with haste.
2. 2Activate Ashnod's Altar by sacrificing Kiki-Jiki, adding .
3. 3When Kiki-Jiki dies, the nontoken and token Prowling Geistcatcher's first abilities trigger.
4. 4Resolve the token Prowling Geistcatcher's trigger, exiling Kiki-Jiki from your graveyard.
5. 5Resolve the nontoken Prowling Geistcatcher's trigger, doing nothing.
6. 6Activate Ashnod'sAltar by sacrificing the Prowling Geistcatcher token, adding .
7. 7When the token Prowling Geistcatcher dies, its second ability and the nontoken Prowling Geistcatcher's first ability triggers.
8. 8Resolve the nontoken Prowling Geistcatcher trigger, putting a +1/+1 counter on it.
9. 9Resolve the token Prowling Geistcatcher trigger, returning Kiki-Jiki from exile to the battlefield.
10. 10Repeat.

Effects

• Infinite +1/+1 counters on a creature
• Infinite colorless mana
• Infinite creature ETB
• Infinite creature LTB
• Infinite creature sacrifice triggers
• Infinite death triggers