Im predicating a lot of my predictions on the experience counters being a theme in every deck with each Commander having different conditions for stacking the counters and different rewards for getting them
Created all the way back in 1996, the list has been the subject of debate from the day it was created, and now, nearly 25 years later, it continues to cause discussions (and problems)
Proliferate + poison payoffs: Bloated Contaminator, Urban Daggertooth, Cankerbloom, Ichorspit Basilisk, backed by protection Snakeskin Veil, Blossoming Defense, Royal Treatment
Between the releases of Expedition Base Set in 2002 and EX Team Magma vs Team Aqua in 2004, Nintendo tried to make the Nnitendo e-Reader a thing with the Pokmon TCG
Theres no once per turn clause here, but the mana required essentially locks it to that anyway