Happy birthday Mark!!!
In a recent game of commander with my friends, something truly hilarious happened. I was able to copy an Ancient Golden Dragon with my Vesuvan Shapeshifter, which had already four +1/+1 counters. It was a really big play, since I'd be able to establish defenses with a single attack. So I attack, deal combat damage, roll the d20 and... natural 1. We all laughed for minutes straight.
I create one 1/1 token, pass the turn, and in three consequent attacks, I get defeated.
It was hilarious and one of the best games I played in recent times :')

: )

Hi Mark, can the rules currently support multiple Double Faced cards with the same front but different backs, OR multiple Double Faced cards with different fronts and the same backs (not like a meld, but identical back faces)?

As an example, say 4 cards that were the same card on the front, but 4 different alternate versions on the back, like a D&D druid with 4 different wild shape variations, OR 4 cards that were different creatures on the front, but the back were all the same legendary shapeshifter (Ovar, Lazav, etc), and the backs were identical.

The rules can’t support same front differential back, but can, hypothetically, support different fronts, same back.

If/when a card that wouldn’t be a shapeshifter if it didn’t have changeling (as in it isn’t listed in the type line)

I don’t understand what it is you’re asking for.

If a shapeshifter appears in art as a character you name with Vorthos, does it count for Vorthos? (The Moment appears as Rose Tyler.)

That’s a question for you inner Vorthos. Technically, the character “appears” in art, so you can use it, but you know it’s just a technicality, so this choice is yours.

Un-question, for Acornelia, does she count squirrel shaped art? For example Sylvan Anthem has a squireel shaped leaf

It has to be an actual Squirrel. If a Shapeshifter/Changeling, it has to currently be in the shape of Squirrel.

Does Meet & Greet "Sisay" count as having Sisay in the art for Vorthos, even though it's clearly a paid actor?
On a related note, does Jilt count as having Yawgmoth or Hannah in the art? Because, as per the flavor text, that's *not* Gerrard's Hannah.

Having a character either dressed up as that character or a shapeshifter shifting into that character’s form passes the bar for visually referencing the character. The main idea of Vorthos is to let Vorthoses have fun making a deck flavored around a character.

Surprise Party asks you to use "printed Clown Robot tokens". This refers to the creature types on the tokens, so can I use Shapeshifter tokens with changeling?

Does that exist as a printed token?

If I controlled Acornelia, Fashionable Filcher and cast Realmwalker (or any other changeling), would I get an acorn counter from Acornelia's art-matters cast trigger? Realmwalker doesn't *look like* it has a squirrel in the art, but seeing how it *is* a squirrel, I thought it might still work, but I wasn't sure.

No, the illustration has to look like a squirrel. A changeling (or shapeshifter) might have the potential to turn into a squirrel, but Acornelia cares that they are pictured as a squirrel.

What is the likelihood of ever getting a Sliver Planeswalker?

Low, being that it wouldn’t do what people think it would nor does it make great flavor sense as most Slivers aren’t sapient.Again, Slivers are shapeshifters that share a group mind. Other Slivers can fly when near a Winged Sliver because it’s implanting the knowledge of how to grow wings. There’s no way to share knowledge of having a spark. There’s nothing to shapeshift into to be able to planeswalk.

-Er creature types: Nightstalker, Sliver, Shapeshifter, Specter, Soldier, Assembly-Worker, Spider, Artificer, Archer, Rigger, Berserker, Spellshaper, Salamander, Volver, Elder, Beholder, Bringer, Ranger, Badger, Thopter, Flagbearer, Badger, Otter, Oyster, Carrier, and Monger. Silver Border: Gamer, Paratrooper, Waiter, Proper (from Miss Demeanor, whose current typeline is Creature — Lady of Proper Etiquette), Designer, Lobster, and Wrestler.

FYI : )