Asha, Secretive Sorceress

Hexproof, Protection from non-creature spells
you don't control
{w}{u}{b}{r}{g}: Until the start of your next upkeep,
Asha, Secretive Sorceress becomes a Dragon
creature with Flying and Trample in addition to
her current abilities, base power/toughness 7/7,
with "Whenever this creature deals combat
damage, draw that many cards, then place that
many non-land permanents onto the battlefield
tapped."