Annie, the Dark Child

Hexproof
During your turn when you cast a spell, if it's
your first spell of the turn and it has a converted
mana cost of 4 or greater, you may create a
5/5 Legendary Red Bear creature token with
Trample and Haste named "Tibbers."
Whenever you cast a red spell with converted
mana cost 4 or greater, deal 5 damage to any
target.