Hole filling, I chose Warrior's Honor, and random generator gave me Mox Pearl. Huh. This could have come out much less interesting in the exchange, so I'm thankful for that. While I'm tempted to make a cycle of Mox instants... this is probably better left as a one trick card.

Pretty much strictly better than Ramosian Rally. Which is probably fine, as although I like that card, it's not like it made waves anywhere.

Is the wording deliberately "~ costs " rather than "You may pay rather than etc"? Because this way affects a whole bunch of things. It can be cascaded into, it's possibly the only card ever with a variable CMC in non-stack zones, and most oddly of all, I'm not completely convinced it's actually still white most of the time.

Mostly, I just couldn't remember how to do it, and was having trouble finding the best wording, so I figured "what would this hurt?". You're right, though, it would hurt a lot. Having to keep track of what casting cost it has right now, alone, would infer that it's not an ability that should be showcased on a common, at least.