Ravens Feather

When Ravens Feather enters the Battlefield,
attach it to target creature you control with counterstrike.
Equipped creature has as much +1/+1 as high the counterstrike of the equipped creature is.
Whenever equipped creature deals combat
damage to a player, create as many 1/1 Blue Raven Tokens with Counterstrike, as high the couterstrike of the eqipped creature is