Hmm. I'm not sure how I feel about this.

The original plan was to give Beebles a cover spell. They sure do like to evade, but they could use a bit of protection while evading. So idea number 1 was "Flash. Creatures you control gain Shroud." Very fitting. Unfortunately, it's kind of a bad spell. I mean, it stops your Doom Blade, and future Doom Blades... but it would have done that without the flash. 6cc flash spells are clunky. You probably weren't going to catch a spell with it, and if you did, what real benefit were you gaining?

Second idea "Flash. Pro color of choice." also was tossed when I realized it was another form of evasion. The third idea "Flash. when ~ enters the battlefield, exile target spell. Cards with the same name as the exiled spell can't be cast." Is kind of a good spell. I should throw that thing into Cards with no home. It doesn't work with the beebles, though, since the tribes like to cast spells with the same name over and over again. That's a spell the Mirrans should have instead.

So, I eventually landed upon this Flashing Propaganda variant and figured I'd let it sit for now in my noggin. It's a little worse than Prop (not counting Planeswalker attacking) but the round you play it, you're probably going to get a Holy Day in the exchange.

Is it Blue? Propaganda was blue and is now white. Flashing was white... but is now more blue (though, I still think flash is still white). I'm guessing that makes this okay?

It mostly seems less good than Ghostly Prison whilst being more expensive. But the ability to flash it for a Fog-lite kinda works. But yeah; white + green = white-blue? Odd.

I looked over the notes of Ghostly Prison and Propaganda when making this card. Both cards have a number of people boggled over why those cards aren't rares. Personally, I think they're too expensive, but they got grandfathered in at their costs, and no one is complaining because they fight the good fight (if the good fight is getting people to not notice you in a multiplayer game until you crush everyone with your combo).

Also, if it makes you feel better, flash also means this card can be played next to counterspells or Rebuke... you don't really need to use the fog trick for flash to be relevant. But, yeah, it sits weird in my mind, too. I might need to try again. I'm not sure.

Looks fine to me. Flash is primary blue and green, secondary all colours when necessary. Taxing is white. Ghostly Prison is white, although these days Fog is back to being green (it spent a while in white recently).

I also like that this lets the opponent tap their creatures before you flash it in. Although contrariwise they can still get attack triggers even if they don't pay.

Seems fine.