Tab, Shady Progenitor

Double Strike, Haste, Menace Shadow (This creature can block or be blocked by only creatures with shadow.) Token creatures gain Shadow and Haste. Creature spells any player casts gain offspring {1} as they cast them. (You may pay an additional {1} as you cast a creature spell. If you do, when that creature enters, create a 1/1 token copy of it.)