Towazu, Kami of the Forbidden

Flying, trample
Each Arcane card in your hand has "Splice onto
Arcane: {0}." (As you cast an Arcane spell, you may
reveal that card from your hand and pay its splice
cost. If you do, add that card's effects to that spell.)
{w}{u}{b}{r}{g}, {t}: Target player draws a card for
each instant and sorcery card in your graveyard.
At the beginning of your end step, discard your
hand.