With modern design sensibilities, I think we could get something far better than what we have to work with right now
Giving your opponent a land is a downside, but the efficiency is hard to trump
After you first resolve a spell with this name, you may cast a copy of it from exile without paying its mana cost at the beginning of each of your first main phases.) Sorcery - Lesson Into the Time Vortex Cascade (When you cast this spell, exile cards from the top of your library until you exile a nonland card that costs less
Shantottos Coercion Diabolic Intent is probably playable with a bunch of Hecteyes, job select stuff, and exciting cards to tutor
Its eBay all the way
Sales of trading cards, and especially Pokmon with its famous catchphrase, "gotta catch 'em all", have surged in value in recent years