Xantha, Knowledge Bound

Artifact and Enchantment spells you cast cost
{2} less to cast.
Whenever an Artifact or Enchantment you
control would be put into your graveyard, you
may exile it instead.
{1}{w}, {t}: Create a copy of target permanent
exiled with Xantha, Knowledge Bound and cast it
without paying its mana cost. Sacrifice it
at the beginning of your next upkeep.