Glerm, Master Pioneer

Haste
Whenever you discard a instant or sorcery card
you may cast cards from your graveyard that
share a card type with the discarded card by
exiling a card from your graveyard in addition
to its other costs until end of turn.
{t}, Discard a card: The next spell you cast costs
X less to cats where X is the number of cards
you own in exile.