So once I have declared the block the opponent can't add the protection?
The opponent can still add the protection, but at that point because it is already blocked it will remain blocked. However any damage dealt to it by a white creature (assuming they name white) will be prevented.
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I now pay 2 activating Wishmonger's ability and give itself protection from white.
The opponent pays two to give his creature protection from white.
What happens next?
If the two were already blocking & blocked with each other, the combat damage they eventually assign to each other would be prevented.
Awesome avatar provided by Krashbot @ [Epic Graphics].
The opponent can still add the protection, but at that point because it is already blocked it will remain blocked. However any damage dealt to it by a white creature (assuming they name white) will be prevented.