Joseph, Arcane Emperor

Vigilance, first strike, menace, haste, flash
You have no maximum hand size
You may pay {w}{u}{b}{r}{g} instead of paying the
mana cost of spells you cast
{w}{u}{b}{r}{g}: draw 3 cards, gain 6 life, deal 6
damage to any target and then add 3 mana of one colour to your mana pool where X is your hand size
{2}{w}{u}{b}{r}{g}: you draw 5 cards, then gain X life,
deal X damage to any target and add X mana of any colour to your mana pool where X is the number of cards in your hand