­Keeper of Ezellohar makes sense in both green and white. Appropriate to give white the smaller body with it.

I feel, a more aggressively statted card might fit the decks that want the card's effect more, but resisting a toughness-based sweeper is probably also a decent call with this.

I wonder whether I should (re)print something like this in Valhar.

I didn't realize I was jacking your line of text. Sorry!

Eh; white is certainly the colour of "Thou shalt not". The 'can this really be green?' argument you've already had on the keeper. Independent invention is a thing.