Mindbender Spores

Creature — Fungus Wall0/1$1.58

Defender (This creature can't attack.) Flying Whenever this creature blocks a creature, put four fungus counters on that creature. The creature gains "This creature doesn't untap during your untap step if it has a fungus counter on it" and "At the beginning of your upkeep, remove a fungus counter from this creature."

Legal in Commander