Thunder Strike can target any creature, even one that already has first strike or double strike. (If it affects such a creature, it will, in effect, just give it +2/+0.)
If a creature doesnâ€™t have first strike, granting it first strike after combat damage has been dealt in the first-strike combat damage step wonâ€™t prevent it from dealing combat damage. It will still assign and deal its combat damage in the second combat damage step.
BUY THIS CARD