Kel, Spiritual Clover

When Kel enters the battlefield, choose a different opponent X times. Each opponent chosen this
way creates a 0/1 Clover Petal token with "This creature can't attack, block, be sacrificed, be destroyed, be exiled, be returned to a hand, or
put in a deck." Then, you create a 0/1 Clover
Petal token."
At the beginning of each upkeep, if you control 4 Clover Petal tokens, create a 5/5 Spirit with
Flying.