While this Tribute Summoned card is in the Monster Zone, your opponent cannot activate the effects of Special Summoned monsters on the field with less ATK than this card
Back in the early days there was Wheel of Fortune and similar effects, which had a lot of potential, but were also highly situational
He plays the card face down, then plays Feral Imp (Gremlin) in defense (1400 DEF)
Once per turn, when your opponent would Special Summon a monster(s) (Quick Effect): You can detach 2 materials from this card, and if you do, negate the Summon, and if you do that, destroy that monster(s)
Extra Deck Outside of the mandatory 3-3 ninja fusions, and two Saizo, you have a lot of freedom with what you wanna do here
It's an easy road to start adding To be transparent, my current leading idea is that a commander is a Game Changer if it creates play patterns or game constraints that are unfun and overwhelmingly powerful or if it qualifies by virtue of being a Game Changer in the other 99 cards of a Commander deck