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Anyway,
Swans of Bryn Argoll are pretty sweet, assuming you're playing it alongside some burn. Turning
Lightning Bolt into
Ancestral Recall is extremely powerful, and it only gets more powerful when you throw in stuff like
Blasphemous Act and other wants-to-be-hit cards like
Boros Reckoner. Its color is a bit awkward though, since most of those payoffs (and enablers) are in red, forcing you into three colors. I will call out
Illusory Ambusher as another instance of this effect in blue.
Awkwardly, it's pretty bad as a blocker - allowing an opponent to draw a bunch of cards when it blocks is a pretty significant downside. As far as attacking goes, a 4/3 flyer for 4 is pretty good... but, again, your opponent will often be heavily incentivized to block if able. It being a symmetric effect probably won't come up that often (since burn spells aren't played that widely), but will come up occasionally.
So... yeah. Sweet build-around, but in colors that don't take great advantage of it. It's also a unique enough effect that it's somewhat difficult to build around, but its asymmetry means I wouldn't want to throw it in a deck that wasn't able to abuse it. I guess the one commander I'd call out as working particularly well with it is
Sevinne, the Chronoclasm, who also likes things that synergize with damage prevention.