but it seems rather strong, despite the multicolor. I'd probably make it 1/1 and if you want the both of the protections, add 1 colorless to the cc at least.
Why would you waste 4 mana on a 2/1 which, if you were playing exclusively W/B, you couldn't do anything to? Makes zero sense. The 1WB version works for me, but I wouldn't use it no matter what it cost. (Unless it was 0)