Hired Help

{2}{u}: Target Imperial, Stormtrooper, or Mercenary can't be blocked this turn.
Whenever Hired Help deals combat damage to a player, amass Stormtroopers 3. (Put three +1/+1 counters on an Army you control. It's also an Stormtrooper. If you don't control an Army, create a 0/0 black Stormtrooper Army creature token first.)