Creature — Goblin Rogue 2/1, 3B (4)
Uncommon
Prowl {1}{B} (You may cast this for its prowl cost if you dealt combat damage to a player this turn with a Goblin or Rogue.)
Whenever a Rogue you control attacks and isn't blocked, it gets +2/+1 until end of turn.
Illus. Brandon Dorman

4/1/2008: This ability triggers after blockers are declared during the declare blockers step. Each attacking Rogue you control gets +2/+1 if no creatures were assigned to block it. That creature will get the bonus even if an effect causes it to become blocked.
Legal in Vintage (Type 1)
Legal in Legacy (Type 1.5)
Legal in Classic (MTGO)
Legal in Commander
Legal in Modern