I was playing a Sliver deck vs a co-worker today, and he played an illusion deck with Ixidron. I was having a hard time grasping how Coat of Arms would work with Ixidron turning everything face down.
Ixidron basically says all face-down cards are creatures. Is creature a type that Coat of Arms would be pairing with and make everything huge, or would coat of arms essentially do nothing to all of those face down cards?