There's no arguing that this is a repeatable explore card with an upside to activating it
It can drift into less strong builds, but they can definitely be a lot of fun when you combine all your legendary knights
Is Viral Spawning legal to play
Also, there are lots of X spells that create creatures at instant speed, like Call the Coppercoats, Decree of Justice, White Sun's Zenith, so you could set up an easy win in EDH by casting a big spell, attacking the next turn, and untapping to win

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Just having Anya as a 7/7 indestructible is good, and from there youll have a nice threat