mtg legendary matters cards Solve the Equation - Can You Play "Legendary Matters" in Any Deck? Mind into Matter - Promo

The eight-costed demon shouldn't be too much of an issue with all the mana we're going to be able to produce, and with lots of thopter tokens floating around from cards like Efficient ConstructionEfficient Construction and Thopter Spy NetworkThopter Spy Network we will be assembling kills so fast Donald Trump won't even believe my claim about how fast we'll be assembling kills

The other description used for this list is simply top which is synonomous for best

It will not allow you to attack during their turn

Sticking to a theme made the deck feel like death by a thousand cuts instead of getting combo'd in a single turn