abaddon the despoiler mtg card spells you cast from your hand with mana value X or less have cascade Abaddon the Despoiler

Emrakul, The Promised End Current price: $56 As anyone who's tried to upgrade the Ulalek Commander precon from a couple years' back will know, the big Eldrazi titans are too darn pricey

Den Protector is no Eternal Witness

That's next level good - it would probably be strong in literally any trading card game - but your rewards here are fleeting: at the end of your turn you put all the cards in your hand on the bottom of your deck

It is so strong, it had to be banned in Pioneer, and therefore I think I should take home the number one rank

You can't pay 2 life to pay for generic mana in costs you pay, even if an effect says that you must spend black mana to pay that generic mana