Throt the Unclean

All Beast cards you cast cost {1}{b} less to cast.
When Throt the Unclean enters the battlefield, you may search any library for up to two Beast creature cards and exile them. You may cast the exiled cards for as long as they remain exiled and spend mana as though it were mana of any color to cast them. If you cast either exiled card, it enters with an additional +1/+1 counter and is a Rat Horror in addition to its other types.