Ekthi, Contaminator Priest, Sword of the Meek, and Atog

Prerequisites

• Ekthi, Contaminator Priest on the battlefield
• Sword of the Meek in hand
• Atog on the battlefield

Steps

1. Cast Sword of the Meek by paying
2. When Sword of the Meek enters, its living weapon ability granted to it by Ekthi triggers
3. Holding priority, activate Atog by sacrificing Sword of the Meek
4. Resolve the Sword of the Meek trigger, creating a 0/0 Phyrexian Germ creature token
5. It'll enter as a 1/1 due to Ekthi's static effect
6. When the Phyrexian Germ enters, Sword of the Meek triggers, returning Sword of the Meek from your graveyard to the battlefield attached to the Phyrexian Germ
7. Repeat from step 2

Results

• Infinitely large creature until end of turn