Auroria, Mythical Enchantress

Hexproof
When Auroria enters the battlefield, Detain all nonland permenants your opponent controls with converted mana cost of 4 or less until your next upkeep.
Instant and Sorcery spells you cast cost {1} less to cast.
{2}{w/u}{w/u}: Target a noncreature nonland card in your graveyard and add that card to your hand.