Shar, Lost Mage

{2}{g}{u}{r}, {t}, Discard a card: Exile target spell, activated ability, or triggered ability. If it is an
instant or sorcery spell or an ability, copy it.
You may chose new targets for the copy.
Hexproof
At the beginning of each end step, if you spent
10 or more mana that turn, exile Shar, then
return him to the battlefield transformed.