Skystrike Officer

Flying
Whenever this creature attacks, create a 1/1 colorless Soldier artifact creature token.
Tap three untapped Soldiers you control: Draw a card.

Magic Online Promos

"Landing zone is clear. Activate and deploy!"

The Brothers' War Promos

The Brothers' War

Since Skystrike Officer's activated ability doesn't have a tap symbol in its cost, you can tap creatures that haven't been under your control since your most recent turn began (including Skystrike Officer itself if you'd like) to pay the cost.