Doran, the Siege Tower, Angelic Protector, and Lightning Greaves

Prerequisites

• Doran, the Siege Tower on the battlefield
• Angelic Protector on the battlefield
• Lightning Greaves on the battlefield
• An opponent is unable to block and kill Angelic Protector

Steps

1. Activate Lightning Greaves' equip ability by paying , targeting Angelic Protector
2. Angelic Protector triggers, giving itself +0/+3 until end of turn
3. Resolve the Lightning Greaves ability, attaching it to Angelic Protector
4. Activate Lightning Greaves' equip ability by paying , attaching it to another creature you control
5. Repeat an arbitrarily large number of times
6. Deal combat damage to an opponent with Angelic Protector, causing the opponent to lose the game due to having zero or less life

Results

• Infinite combat damage to an opponent