To fill up your graveyard, Celes, Rune Knight and Mog, Moogle Warrior arrive with potent effects that get creatures into your graveyard, with the Celes also being her own wincon and value engine with her ability to grow your whole board every time a creature enters from your graveyard
Being able to turn a creature into two colorless mana can ramp you up exponentially, especially when you have a way to continuously make new token creatures to sacrifice to it
Jace solves it quickly, and as it turns out...The point of the riddle wasn't to see if he solved it
(Look at the top three cards of your library, then put any number of them on the bottom and the rest on top in any order.) Illustrated by Trevor Hairsine Standard Not Legal Alchemy Not Legal Pioneer Not Legal Historic Not Legal Modern Legal Brawl Not Legal Legacy Legal Comp
Building your own deck, finding other players decks, and playtesting your deck are all easier here than on competing sites
Throw in a splash of limited stock for (justified) fan hysteria