Guile, Temporal Extortion, and Professor Onyx

Prerequisites

• Guile on the battlefield
• Temporal Extortion in hand
• Professor Onyx on the battlefield
• Your life total is at least 2
• available

Steps

1. Cast Temporal Extortion by paying
2. Temporal Extortion and Professor Onyx trigger
3. Resolve the Temporal Extortion trigger, causing you to pay half your life total, rounded up, and then exile Temporal Extortion and cast it without paying its mana cost due to Guile
4. Repeat from step 2 until your life total is four or less
5. Temporal Extortion and Professor Onyx trigger
6. Resolve the Professor Onyx trigger, causing you to gain two life and each opponent to lose 2 life
7. Resolve the Temporal Extortion trigger, causing you to pay half your life total, rounded up, and then exile Temporal Extortion and cast it without paying its mana cost due to Guile
8. Repeat from step 5

Results

• Infinite lifegain triggers
• Infinite lifeloss
• Infinite magecraft triggers
• Infinite storm count