Santa Claus

Spells in players hands gain Assist. (Another
player can pay up to {x} of this spells mana cost)
When a player Assists a spell that player draws a
card and creates a colorless Present artifact token
with "{3}{t} Sacrifice this artifact: Reveal top card
of target players library. If it's a nonland
permanent, you may put it onto the battlefield
under your control."