A Bird-lord for Soldiers and Knights.

Nice! Bit small for a mythic, but otherwise very nice.

I'd name him Assassin, for the ability. Pricey, but good. "Take out your entire attack in one combat trick" good, so probably worth the cost; but nasty to have to keep five mana open. Seems about right to me, therefore.

He's white, so being an Assassin isn't very appropriate. I'm not even sure I want it to destroy tapped creatures, I just didn't like the idea that you would essentially be forced to play this guy during your opponent's attack phase. And Gideon Jura suggests white can still get Assassinate sometimes.

Fair enough, and he's also able to take out most support creatures this way. (Guilty by association! To the sky with you!) I'd still usually want to save him - Reading this as "White removal at 5, with a free flying creature token" makes it look a lot better than reading it as "Overpriced flyer, that kills a thing"

It's actually very similar to Shriekmaw. Alternatively, Second Thoughts; "draw a card" is the same card advantage as "get a 3/3 flyer" but obviously worse, which is what the rarity jump (and exile->destroy) gets you, I guess.

Right, the dream is obviously to snag a 3-for-1 by flashing this in mid-combat and blocking a 2/3 (hence rare), but more often than not it should be a white Shriekmaw.