Creature spells you cast cost {1} less to cast.
Whenever another creature enters the battlefield under your control, Marauding Raptor deals 2 damage to it. If a Dinosaur is dealt damage this way, Marauding Raptor gets +2/+0 until end of turn.
Effects that reduce the generic mana cost of a spell (such as that of Marauding Raptor) can't reduce that spell's colored mana requirements.
Marauding Raptor's cost reduction doesn't affect itself.