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

Toph, Greatest Earthbender

Ashaya, Soul of the Wild

Felidar Guardian

How it works

1. Cast Felidar Guardian by paying its mana cost.
2. When Felidar Guardian enters, it triggers, blinking Toph.
3. When Toph enters, it triggers, earthbending Felidar Guardian as it's a land due to Ashaya.
4. Since 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. Toph triggers, returning Felidar Guardian from your graveyard to the battlefield.
6. Repeat from step 2.