Doran, the Siege Tower + Angelic Protector + Lightning Greaves

Doran, the Siege Tower

Angelic Protector

Lightning Greaves

How it works

1. Activate Lightning Greaves' equip ability by paying 0, 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 0, 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.