Encroaching Mycosynth + Daretti, Scrap Savant + Spark Double + Felidar Guardian

Encroaching Mycosynth

Daretti, Scrap Savant

Spark Double

Felidar Guardian

How it works

1. Activate Daretti's second ability by removing two loyalty counters from them, sacrificing any other nonland permanent and returning Spark Double from your graveyard to the battlefield.
2. Spark Double enters the battlefield as a nonlegendary copy of Daretti.
3. Activate Spark Double's second ability by removing two loyalty counters from it, sacrificing Spark Double and returning Felidar Guardian from your graveyard to the battlefield.
4. Felidar Guardian enters the battlefield, blinking Daretti.
5. Repeat, sacrificing Felidar Guardian in step 1.