Toph, Greatest Earthbender + Ashaya, Soul of the Wild + Felidar Guardian

Prerequisites

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Steps

1. 1Cast Felidar Guardian by paying its mana cost.
2. 2When Felidar Guardian enters, it triggers, blinking Toph.
3. 3When Toph enters, it triggers, earthbending Felidar Guardian as it's a land due to Ashaya.
4. 4Since zero mana was spent to cast Toph, Felidar Guardian becomes a 0/0 creature and dies as a state-based action due to having 0 toughness.
5. 5Toph triggers, returning Felidar Guardian from your graveyard to the battlefield.
6. 6Repeat from step 2.

Effects

• Infinite creature ETB
• Infinite creature LTB
• Infinite death triggers
• Infinite landfall triggers