According to Wizards of the Coast, this is a printing error which was never corrected, as all card backs have to look the same
it gives you an Elemental token whenever you play an instant or sorcery
Karazikar, the Eye Tyrant, Marisi, Breaker of the Coil, Kardur, Doomscourge, Baeloth Barrityl, Entertainer and Firkraag, Cunning Instigator all bring out the worst in opposing creatures
Mixing white, blue, and black gives you access to strong control tools, tricky value engines, and powerful artifact synergies all in one deck
If youve been playing Magic: The Gathering for any length of time youll understand that there are some very big and expensive creatures in the game that can only be allowed because they cost a lot of mana