Cards to set my creatures' power to 0?

I'm playing a [[Tadeas, Juniper Ascendant]] deck that uses a reach and toughness matters theme so my creatures are unblockable. I have ways to boost their toughness and most of them have lower power but I'd like to be able to set my commander's power to 0 instead of 1 so he can't be blocked by 1/1's. The idea would be to buff him and kill people with commander damage. Any suggestions on lowering his power without lowering his toughness?