Honestly, I think a simple and effective way to deal with a wide collection of decks would be to use Chalice of the Void and to a lesser extent Trinisphere . Just taking a look at what is stopped by Chalice of the Void when X equals # gives a decent indication as to its potential in sideboards.
X = CMC 0:
Mainly Living End . Since cascade casts the spell and Living End has a converted mana cost of 0, you can simply plop a Chalice of the Void down onto the battlefield your first turn for free and sit back knowing that outside of some sort of removal, you've pretty much neutered their deck.
X = CMC 1:
Zoo, Pyromancer, Splintertwin, and Infect. While paying for X = 2 would probably be a better choice against some of these depending upon the build (Zoo), this does a wonderful job against anything that relies on being able to Preordain , Ponder , Serum Visions , or Gitaxian Probe through itself. As an added benefit, it also protects itself from Shattering Spree . No such luck with Ancient Grudge .
Anyway, I'll use three or four in my 12-Post sideboard, since it's not hard to generate mana for it and there aren't many low cost spells that I wouldn't be able to play because of it. I'm not sure it fits well anywhere else but it's an option if the environment becomes saturated with combo decks.
Without artifact mana like in legacy (No mox diamond, chrome mox is banned) chalice of the void is too slow, you can't drop a chalice for 1 until turn 2 and on the draw thats too slow, because there are turn 2 kill decks like this (www.wizards.com/Magic/Magazine/Article.a...).
I've played legacy Goblins for years which has always been week to fast combo decks, the best answer is Mindbreak trap but thats extrememly narrow and only hits storm based combo, does nothing to splinter twin decks.
The problem is that there is no control decks to keep the combo in check.
Look at the legacy metagame, in general: Aggro > Control, Control > Combo and Combo > Aggro. With the bannings for modern as they are control gets short end of the stick.
In my opinion what wizards needs to do is unban Mental Misstep and sensei's divining top which will make Counterbalance a real deck and gives you a genuine control deck, this will never happen though because wizards hates Div Top.
Twin is easy to stop on paper, and the lack of people playing mindbreak trap for storm and pyromancer decks is absolutely jaw-dropping.
So yes, if you don't run combo stoppers, you can't stop combo :o ! WEIRD!!1!
How does mindbreak trap work vs stormand pyromancer decks. Im still confused how this card works and how it works vs these decks
Storm, and Pyromancer decks by extension, make use of cards that have storm (kind of obvious) such as Grapeshot or Empty the Warrens as their win conditions. Because they also rely on casting multiple spells in a turn in order to build up a large storm count, they will always have cast three or more spells when they try to go off. So you can respond to them casting one of their win conditions by casting Mindbreak Trap for , exiling all their spells and saving you.
Solution to control being unviable: Ban Emrakul. Unban Visions.
Oh, and unban Bitterblossom. Seriously. Why was that card on the ban list?
Bitterblossom can't be unbanned, as long as it produces faeries. The synergy with spellstutter and mistbind is what causes Fae to have such a suppressing effect on meta diversity.
I could see them banning emrakul, just to make it easier for people to use instant speed removal against the breach/vengeance decks.
What makes me worry about modern is the fact there was zero pure aggro decks that made top 16 or top 8. Boros was a deck everyone was thinking it could do well in modern and instead Boros doesn't even crack a decent chance to win. Why because in order to play aggro you need some sort of trick, like poison or sheer amazing draws which won't happen. So unless so share amazing meta game shift happens modern is going to become like extended, expensive and stale in deck choices.
What makes me worry about modern is the fact there was zero pure aggro decks that made top 16 or top 8. Boros was a deck everyone was thinking it could do well in modern and instead Boros doesn't even crack a decent chance to win. Why because in order to play aggro you need some sort of trick, like poison or sheer amazing draws which won't happen. So unless so share amazing meta game shift happens modern is going to become like extended, expensive and stale in deck choices.
I don't think very many people were expecting Boros to be a deck. I personally expected 12-post, Zoo, and some combo (though I underestimated the "some combo" to be a little more than some).
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