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What can help 4c landstill versus even slower control decks that play significant threats, like itf (recurring stuff), mono blue control (back to basics + better draw, more counters), uw landstill...

I played vs the deck in the semifinals and obviously it is strong versus slower control decks and witness+slide is definitely hard to deal with. The list looks rather underwhelming compared to...

First of all, I like your approach.

What I dont understand is the amount of possibly "random" 1-ofs in the list without a tutoring effect for it, like fire/ice, diabolic edict or thoughtseize.
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Aether Vial in this list seems not just cute to me, it's not just an enabler for dreadnaught (though it can be used to get naught into play without stifle). This is an aggressive creature based deck....

I tried to make that concept with chalice work for a while and I dont understand why you dismiss it so abruptly. I used Mox Diamond + 4 Chalice which was a "debateable" choice, but it still worked...