Each creature you control with a counter on it will count for one card for Gamma Grotesque's power-up ability, no matter how many counters it has on it, what kinds of counters they are, or which player put the counters on that creature
You may level up a creature as many times as you like
This gives me Necrotic Ooze vibes, a card that Ive loved and played in multiple formats since it was printed way back in Scars of Mirrodin
Crystalline Giant Crystalline Giant is an easy-to-cast card that only gets better the longer its on the battlefield
Gretchen Titchwillow One of the strongest colors in Pauper Commander is Simic, and currently, the standard-bearer for this color pair is Gretchen Titchwillow
My general rule of thumb is that for every two MDFC lands in my deck , I cut one land