Yuletide Blast

At the beginning of each players upkeep, they flip a coin. If they win the flip, then they may cast a nonland card from their hand without paying it's mana cost. If they lose the flip, then Yuletide Blast deals damage to that player equal
to the number of cards in their hand.
"Deck the halls with bombs and crawlies, fa la la la la la la la!"-Rakdos Christmas Carol