Mavis, Scaled Shifter

Changeling
Shocky Claws - Whenever you cast a spell that
deals damage to a creature Mavis, Scaled Shifter
gains Haste and Double Strike until end of turn.
Draconic Spellcraft - {3}{r}: After Mavis, Scaled
Shifter has attacked this turn you may cast an
instant or sorcery from your hand without
paying its mana cost. Activate only as a sorcery.