The Name Game (Vol. II)

{viriss}
Reads interesting but in reality, you will choose the second mode over the first 90% of the time. The fact that the second mode is a nice two-for-one whereas the first mode is actually card disadvantage makes this card's options pretty unbalanced. One could argue that the first mode is just a nice bonus that you can use in niche situations but I like my choose-one-cards to really include choices.
However, exchanging cards in an opponent's hand is a cool idea. I always liked Head Games and could certainly see some interesting cards in that mechanical vein.

{Daij_Djan}
Very powerful and a certain limited game ender as long as you are able to keep one mana open. I get that the protection from its own colors opens up some crazy combo potential but it then should appear in an environment that has cards that change a creatures color (permanently), because otherwise it would be hard to explain why this creature doesn't just say „: CARDNAME gains protection of a color of your choice until end of turn.“

{gateways7}
It's cool. Seeing that it itself is always at least a 3/2 trample with pseudo-persist for I'd say it's powerful but might be okay for a non-standard set. Speaking about non-standard sets, I must say that I'm a bit confused why you didn't just go with the mask tokens that Estrid creates. Seems like the perfect fit to me and you would avoid the problem of having two types of aura tokens doing almost the same (and even having almost the same name). Would also have been a nice throwback imo.

{Boogymanjunior}
Kind of similar to Sword of the Animist but lacks the +1/+1 part. The issue I have with your card is that it can lead to repeated shuffeling in limited games – all you need is a small flyer or a small unblockable creature. This causes the so called loading screens where both players just sit there and wait until the shuffeling is over. The problem here is that limited games usually happen in a tournament setting where people like to shuffle their decks extra carefully, have their opponent cut their deck and everyhing. To make matters worse, games in a tournament setting are usually with a limited time so you can't just lay back like it doesn't matter.
All in all, I always enjoyed Sword of the Animist and can definitely see how your card is actually not a bad one. Don't let my hammering on small issues (although it's a relevant one) mkae you think that I trash your card. Because I cartainly don't.

{Flo00}
Very cool flavor, name and effect here. I'm not 100% sure about the wording as it could lead to problems with token creatures but I consider this a minor problem that could easily be fixed (if it actually is a problem in the first place). The card goes well in morph decks or decks that make you bounce or flicker your creatures. It is kind of a recall to Eerie Interlude, as you said, but funtions pretty different from that card. A strong design, although the card could probably just cost or let you choose any number of target creatures (just like Interlude) instead of all of them and still be fair.

{And the winner is...}
Flo00! With the runner ups Boogymanjunior and Daij_Djan! In the end, Flo00's card was simply the most interesting, yet easy to understand and with a nice flavor to boot.
Thank you all for participating and even more thanks to Daij_Djan who brought this design game back after its accidental deletion. It's nice to have mods who care.