I recognize there are play design reasons to limit these effects, but is Show and Tell / Braids, Conjurer Adept still in pie for blue and is Eureka / Hypergenesis still in pie for green?Can other colors theoretically do this effect for permanent types that they care about?

Avoiding mana costs is dangerous, so we have to be careful how often we do it. All colors have some ability to put relevant things from their hand onto the battlefield, but again, it’s not something we should be doing with any frequency.

In a recent poll in Twitter listing top 4 sets in MTG history, Urza’s Saga and block as a whole received a spot in a lot of them, almost on pair with Invasion, Innistrad or Ravnica. Nonetheless, it seems WOTC still ostracizes the block. So, so many memorable cards that helped define so many decks: Carpet of Flowers, Sneak Attack, Show and Tell, Gaea’s Cradle, Serra’s Sanctum, Gilded Drake, Yawgmoth’s Will, Grim Monolith, Crop Rotation, Frantic Search, Replenish, Academy Rector, Opalescence, Yawgmoth’s Bargain, Powder Keg, Rofellos… and I could go on and on. I love that beautiful, relaxed, cartoony artwork too. Any love for Urzas Block here?

How exactly do we “ostracize” Urza’s block?

If the card show and tell didn't exist, would you have used that name for strixhaven or is it a bit too silly?

Show and Tell isn’t really a college thing.

un-rules question: B.F.M., in regards to sneak attack youve said "B.F.M. Is considered one creature card, but you have to have both halves in the same zone (hand, graveyard, library, battlefield, etc.)", and in regards to show and tell, "No, because you can only choose one card and in your hand B.F.M. is still two cards". reading through rulings, you go back and forth as to B.F.M.'s state as one or two creature cards in non-battlefield zones, do you have a definitive ruling?

My Sneak Attack answer is the correct one. If a card is looking for a creature card in another zone and both halves of B.F.M. are there, the card in question can find the “creature”.

Silver border rules questions: 1) does Richard garfield PHD affect lands, and if so does that mean any land can be any other land; 2) with aesthetic consultation, do you have to name an artist who's illustrated a magic card? 3) can you show and tell BFM?

1. No, lands do not have a mana cost. They do have a converted mana cost of 0, but Richard looks for mana costs.2. Just as you can only name a color that exists when asked to choose a color, you can only pick an existing artist when you choose an artist. Note artist on tokens (where properly credited) can be chosen. Token art is taken into account with “artist matters” cards.3. No, because you can only choose one card and in your hand B.F.M. is still two cards.

Also, hand -> battlefield transitions (ie show and tell) and library -> battlefield transitions (ie birthing pod) are well known as triggering etb effects. Why is this case unique?

Because it’s not moving from one zone to another., It’s being overlayed. This isn’t something black border does.You can’t just appear in a zone in black border.

So Legacy may be drifting away from Magic, but I'd argue it's drifting in a way that makes it a more skilful game. Consider Show and Tell: against an opponent with red mana up and cards in hand, the Show and Tell player has to worry about Red Elemental Blast/Pyroblast. Conversely, the red player has to worry about tapping out for fear of a Show and Tell. If one/two of those cards didn't exist, the format would be rather less skill-intensive. (I'm assuming at least some of these break the pie.)

Don’t confuse options with skill. The pros have stated how skill testing Khans of Tarkir draft is and that has 12,000+ less cards than Legacy.

What are your thoughts on Show and Tell? Do you think we could see it printed again?

Not a developer and no. Skipping mana costs tends to cause problems. The mana system is there for a very good reason.