Drakkar, turncoat sergeant

{b}{b}{b}{r},{t}:Destroy target creature with power
2 or less. If you control two Human soldiers,
this card gets +1/+0 and Vigilance.
If you control three Human soldiers,this card
gets +1/+1 and Vigilance.
If you control four Human soldiers,this card
gets +2/+1 and Vigilance.
If you control five or more Human soldiers,
this card gets +2/+2 and Vigilance and
Double strike.