Tesseract

{t}: {u}{u}{u}. {u}{u}{u}{3}{t}: Tesseract deals 6 damage to up to 3 targets. {t}{x}: Add X mana in any combination of colors.
Humans have +2/+3. When a Creature goes into a graveyard, return Tesseract to its owners hand. "A jewel as vexing an dementions themselves."