Righteous Valkyrie Being alive is a superpower White has had a bit of a rough time in MTG over the last few years
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Ruby/Amethyst might feel too simple for advanced players, and Steel/Emerald could feel confusing for beginners.
What makes him very strong is his metalcraft to equip for free all day long if you control at least three artifacts, which is so easy since it counts lands and tokens, and with the card draw combined with that free equipping, he is an Equipment essential
The Owl is probably better with that ability to grow bigger and the better evasive ability
Paired with Norin the Wary, youre going to generate a ton of triggers for that kind of card