Thrumming Stone, Memory Lapse, and Thousand-Year Storm

Prerequisites

• Thrumming Stone on the battlefield
• Memory Lapse in hand
• Thousand-Year Storm on the battlefield
• You have cast at least one instant and/or sorcery this turn
• 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. Thousand-Year Storm and Thrumming Stone trigger
4. Resolve the Thousand-Year Storm trigger, creating at least one copy of Memory Lapse, with each copy targeting the original Memory Lapse
5. Resolve the first copy of Memory Lapse, countering the original Memory Lapse and putting it on top of your library
6. All remaining Memory Lapse copies fizzle due to no longer having a legal target
7. 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
8. Repeat from step 3

Results

• Infinite magecraft triggers
• Infinite storm count