Torti, Surpreme Sorcerer

Whenever you cast your first noncreature spell
each turn Torti Tort gains power equal to that
spells converted mana cost until end of turn
Whenever Torti Tort attacks, exile the top X cards
of your library, where X is Torti Tort's power.
Until end of Turn, you may cast a non-creature
spell exiled this way without paying its mana cost