Lumbering Lightshield 
Creature — Illusion
When Lumbering Lightshield enters, target opponent reveals a nonland card at random from their hand. It perpetually gains "This spell costs more to cast."
Legality
standardNOT LEGALpioneerNOT LEGALmodernNOT LEGALlegacyNOT LEGALvintageNOT LEGALcommanderNOT LEGAL