{@R} The Pride of Hull Clade (Showcase) (Invisible Ink) [Murders at Karlov Manor][MKM 382]

This spell costs less to cast, where X is the total toughness of creatures you control.
Defender
{2}: Until end of turn, target creature you control gets +1/+0, gains "Whenever this creature deals combat damage to a player, draw cards equal to its toughness," and can attack as though it didn't have defender.