Turian let Tarmogoyf, SFM, and Jace JTMS into the world. MaRo submitted Goyf at 2G and */*. Lead Devs get a lot of leeway/trust (Aaron's said he's probably the only guy who would have pushed Birthing Pod that far.) But with that leeway comes a lot of responsibility.
Sidenote -- I love how difficult it is to properly evaluate cards these days, especially with the introduction of planeswalkers.
Every single spoiler season turns into an unstoppable hype train where everything is simultaneously broken in half and unplayable. Every set is an example of power creep and the next kamigawa.
It's kind of awesome how far the game has come. Even among professional players, cards like Chandra Pyromaster, Boros Reckoner, and Birthing Pod are received in completely different ways. Hell, there wasn't even a consensus in the pro community that Mental Misstep would fundamentally break legacy -- even when something is known to be broken, nobody can agree on exactly
how broken it is.
The unquantifiable nature of this game is wonderful, and I think that's why I enjoy it. Even statistics can't really show what a 'best' card or deck is, even for formats like limited -- look at magic online at 9am and 9pm and you'll find two different metagames for M14 draft. One morning you'll play against people who draft rakdos sacrifice decks and play first, one evening the only viable strategy will be U/X.
When metagames can be at various levels of development depending on
the fucking time of day, I think we've gotten to the point where Magic is a damn near perfect game.
Another striking difference between metagames is the contrast between GP decklists and MTGO Daily Event decklists. Both are highly competitive, but despite many more matches being played on MTGO, that metagame follows the GP and Pro Tour metagames closer.
The fact that metagames have always been a player construct, entirely changeable by outside events and the attitudes of players, will always baffle me. If I play with competitive players in M14 draft, I'll probably follow signals extremely closely but skew myself towards red, as the competitive community is aware of blue's absurd power and wants to play last.
If I'm playing against players on MTGO in the early morning -- players who aren't aware of the "blue or a deck that can punish blue" aspects of the current draft meta -- it's probably correct to just jam blue or green. But people might still be playing aggro in such an undeveloped metagame. Which means it still might be correct to play first. Or it may just be correct to pick Seacost Drake higher.
My head hurts.