>>55692121translating card game mechanics to pokemon is basically impossible, so let's work with what can be translated: stats.
exodia's pieces are quite weak on their own. 200 atk is basically nothing, with shit like level eater (a literal ladybug) having 600 for example.
so in an actual fight, he gets his ass beat by ledyba.
now, for the instant win effect. translating it as an actual move that has to be used (with high priority, reflecting its nature in the card game), he'd lose to a scarf ditto but absolutely nothing else.
thanks for coming to my ted talk.