Quote from Lord Seth »Well, the data point you want to "sink in" is meaningless. So how about a more meaningful data point: You're saying that the metagame needs more cards to deal with Tron, a deck that's never managed to sustain a particularly high metagame percentage and has, with only a few exceptions, generally put up a dearth of results on the top tournaments, only popping up every now and then. Was this a really big finish for it? Of course. But prior to this, there was only one Grand Prix in the history of Modern where Gx Tron managed to get two decks into a Top 8, which was GP Brisbane, back in 2013. Also note that this was in a metagame where Deathrite Shaman was legal, meaning the format was stuffed with BGx. Even if we extend the criteria to Star City Games Opens, we have to go back nearly 2 years (January of 2016, SCG Columbus) before we find another case of a double Gx Tron top 8.
Setting aside the questionable assertion that the format needs those cards to deal with Tron to begin with, you were talking about how Tron threatens Blue decks. How is Green Sun's Zenith, a card that doesn't go into predominately Blue decks, supposed to help Blue decks against Tron?
Perhaps my stance isn't clear, so I'll post it for the 100th time in about 4 years; Too many decks are abusing the basic resource of Magic (Mana) in the Modern format without any tools sufficient enough to combat them.
It's not just Tron, It's Scapeshift, Ad Nauseam, Goryo's Vengeance, Through the Breach, Eldrazi Tron, Bant Eldrazi, and sometimes Affinity and Living End.
Having a Tool box maindeckable card that can be answered sufficiently and add a level of consistency to some green decks is exactly why GSZ was banned initially.
Here is the exact quote from the DCI;
On turn one, this can give the acceleration of a Llanowar Elves by getting a Dryad Arbor. On later turns, it can get a large creature or a one-of "toolbox" creature such as Gaddock Teeg. While this is interesting, it is also too efficient. If one intends to build a deck that has turn-one accelerants, Green Sun's Zenith is a great choice. If one wants to more access to utility green creatures, Green Sun's Zenith is a great choice. If one wants to more reliably get a large green creature, such as a Primeval Titan, onto the battlefield, Green Sun's Zenith is a great choice. However, this ends up with fewer different decks being played in practice, as Green Sun's Zenith is such a good choice that there are fewer green decks that do anything else. The DCI hopes that banning Green Sun's Zenith increases diversity among Modern green decks.
Since then, the number of Green decks have decreased, or in the extreme sense depending on your personal restrictions, been nearly the exact same. So in essence, the decks using GSZ just became invalid when they tried to replace the card, and nothing else spawned out of the format since it's banning. It was used as a police tool for Cloudpost and Storm, we could seriously use it now. It would force Tron Decks to once again run some type of cheap removal like Pyroclasm, instead of going balls deep on just assembling their pieces ignoring the opponent. Yet that's not the only benefactor, it would actually police all the combo decks in their construction. That means most all in combo decks, couldn't be as they are now. The format would slow down as a result, and force higher levels of interaction.
I also understand there is a significant level of risk as well, a deck like Elves could appear to become Tier 1, but could that really be an unstoppable problem in a format with Fatal Push?
It tutors creatures at a higher cost, has a one time use, and is restricted on creature color. And no, I wouldn't even ban Dryad Arbor.