Trelesa, Dedicated Enchantress

Covet Aura (At the start of the game if this is
your Commander you may chose one Aura card in
your library and exile it. It has Coveted for the rest of
the game. When you cast this you may put cards
exiled this way into your hand.)
If a Coveted Aura you control would leave the
Battlefield, you may attach it to target creature
instead.