mtg most complicated card Confounding Conundrums—Confusing Commander Cards — PlayEDH The 26 Most Confusing Cards

Placement: For the safety of younger children, please ensure all items are kept out of reach of those under 36 months, particularly items containing small parts or batteries

That should happen within the first few weeks, I think

Ghidorah, King of the Cosmos (also known as Illuna, Apex of Wishes) (yes these names are unnecessarily confusing) foils have popped to $300+ on TCGPlayer, with only six copies available, and others are heading that way too

Basalt Ravager is FTK but scales its damage off tribal/typal

It matters less if you already run Training Grounds for other reasons, and decks like Brudiclad just want the permanent to turn into a clone of something else anyway