Quicksilver Gargantuan + Felidar Guardian

Prerequisites

• You have enough mana to cast Quicksilver Gargantuan.

Steps

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

Effects

• Infinite creature ETB
• Infinite creature LTB