Felidar Guardian + Quicksilver Gargantuan

WU identity

Commander legal

The 2 combo pieces

• Felidar Guardian
• Quicksilver Gargantuan

How to execute it

1. Cast Quicksilver Gargantuan by paying its mana cost, choosing to have it enter the battlefield as a copy of Felidar Guardian
2. When Quicksilver Gargantuan enters the battlefield, it triggers, blinking Felidar Guardian.
3. When Felidar Guardian enters the battlefield, it triggers, blinking Quicksilver Gargantuan. Choose to have Quicksilver Gargantuan enter the battlefield as a copy of Felidar Guardian.
4. Repeat from step 2.

What the combo produces

• Infinite creature LTB
• Infinite ETB