Thrumming Stone, Memory Lapse, and Swarm Intelligence

Prerequisites

• Thrumming Stone on the battlefield
• Memory Lapse in hand
• Swarm Intelligence on the battlefield
• available

Steps

1. Cast any other spell, or wait for an opponent to cast one
2. Cast Memory Lapse by paying , targeting that spell
3. Swarm Intelligence and Thrumming Stone trigger
4. Resolve the Swarm Intelligence trigger, creating a copy of Memory Lapse, targeting the original Memory Lapse
5. Resolve the copy of Memory Lapse, countering the original Memory Lapse and putting it on top of your library
6. Resolve the Thrumming Stone trigger from step 3, revealing the top four cards of your library and casting Memory Lapse without paying its mana cost
7. Repeat from step 3

Results

• Infinite magecraft triggers
• Infinite storm count