Nicol Bolas, the Ravager / Nicol Bolas, the Arisen Just 4 mana gets you Nicol Bolas, the Ravager and immediately forces your opponents to discard
Estimated from community opening data: 1 SR guaranteed per 30-pack box, ~25% chance of any SA card per box, ~20% chance of an HR rainbow holo, ~10% chance of a UR gold card
Creature-based counters like this have been beloved at the kitchen table ever since Mystic Snake was printed way back in Apocalypse
Finally, some cards have other costs associated with them, such as payment of life or sacrificing a creature
And yes, I am fully aware that there are workarounds to try to make the economy cheaper, with the biggest being playing a bunch of limited and rare-drafting aggressively, but just because there is a weird hack to make a very unfriendly system slightly more friendly doesn't mean the system is good
Itd be a really slick special set