Siege Striker

Belagerungskämpfer (Siege Striker) (de)

Creature - Human Soldier | Power/Toughness: 1 / 1 (CMC 3)
Double strike (This creature deals both first-strike and regular combat damage.)
Whenever Siege Striker attacks, you may tap any number of untapped creatures you control. Siege Striker gets +1/+1 until end of turn for each creature tapped this way.