While playing an Un cube with some friends, we came across an interaction we figured we should ask the official Unrules manager about. If I have a library enchanted with Animate Library, and make a copy of that library using splinter twin, what does it make?

Not what you want. A non-animated library that you can’t draw off of, basically you get nothing.

I just wanted to say thank you to all responsible for printing Prime Speaker Vannifar, as I think it's a very elegant way to breath some life into the old Birthing Pod style lists without making the effect overly problematic. It's one of my favorite cards printed recently. Is it possible we could see a similar fix for Splinter Twin?

That’s a little trickier to replicate on a creature.

So how many messages have you gotten about Splinter Twin being an Aura?

A few. I was thinking cards banned in Standard when I asked, but obviously I didn’t clarify.

Has there ever been consideration of banning certain uses of cards, without banning the card entirely? (For example, Splinter Twin is a potentially useful, but not broken, card on its own; it's only a problem when it goes infinite.) What arguments killed the idea?

The messaging and policing of partially banning cards is too difficult.

"Could red have a hasty, dies-at-end-of-turn clone?" Like Splinter Twin or Kiki-Jiki?

I think they meant now.

Why is Daybreak Coronet is in MM2015. It only pairs with Goblin War Paint and Splinter Twin. There are not enough auras to justify playing this card. I understand that it needed a reprint, but surely it could have been reprinted in a set with more than one common aura.

Some reprints are for constructed and not limited.

Why do you excuse Master of Waves for "being fragile" but hornet queen is "6 flying power" when it's a 2/2 and a bunch of 1/1s? Is Precursor Golem (three 3/3s and "when a spell targets only a golem copy it to each other golem") counted as "a gamble on your opponent getting free value" or "9 power for five mana?" Also, do you feel this pie-breaking infraction is more serious than an accidental combo (splinter twin) or wrong evaluation on a card's format impact (thragtusk) ? All seem serious.

Blue is allowed to make tokens. That is well within blue’s part of the color pie. It’s not a weakness. Flying is supposed to be a green weakness. Green has all sorts of answer to flying because it’s not supposed to get good fliers. Combos will happen but they are much harder to see or catch. Making a card which unto and by itself breaks the color pie, especially when it weakens color vulnerabilities, is something we should have the self-control not to do.

Doubling Season and RTR Jace is a two-card near certain win combo (instant ultimate Jace 4.0, fetch a new Jace and the highest impact card in your opponent's library, repeat with new Jace 4.0). But this combo is a lower power level than some of the Splinter Twin shenanigans that was good but didn't break Standard. What other interactions with DS are Development concerned about?

Doubling Season + most planeswalkers.

Combo, at least lately, seems to only exist when an interaction slips through the cracks (Splinter Twin/Deciever Exarch being the obvious example). Is there any hope we'll see more directly pushed combo decks in the future (albeit more fragile than previous incarnations)? There's kind of a neat Galvanic Alchemist/Axebane Guardian interaction currently, but nothing really interesting.

R&D doesn’t push combo decks. What we do is make open-ended cards and the nature of the system creates combo decks. We then try to crack down on them in broader formats with more cards if we think they are speeding up the game too fast or making things to non-interactive.