Displacer Kitten, Guile, and Frilled Mystic

Prerequisites

• Displacer Kitten on the battlefield
• Guile on the battlefield
• Frilled Mystic in hand
• available

Steps

1. Cast any noncreature spell from your hand by paying its mana cost, or wait for an opponent to cast one
2. Holding priority, cast Frilled Mystic by paying
3. Frilled Mystic enters the battlefield, exiling the spell and causing you to cast the spell from exile without paying its mana cost due to Guile
4. Displacer Kitten triggers, blinking Frilled Mystic
5. Repeat from step 3

Results

• Infinite ETB
• Infinite LTB
• Infinite magecraft triggers
• Infinite storm count