Protection doesnt stop me from sacrificing a creature even if that creature has protection from the spell or ability making me do so
Its hard looking at a card like Chulane and finding faults, but if you needed to nit-pick, you could criticise the mana cost for requiring three different colours, or the fact that it doesnt come with any ways to reduce mana costs for creatures you play
Obviously, having only one Xatu would force you to choose between Power or Attack
You could replace the rare dual lands with some common tapped dual lands, and it would still function, but it would be less competitive because we'll have to play off-curve sometimes
Three-color, like typal, is one of those themes that players enjoy conceptually, that's just really hard to execute on
Since youre playing red/green, your creatures will have high stats anyway