Quote from theinsanething »So what's the consensus on Mistcaller?
Its usage seems to lean towards combatting things like Through the Breach, Goryo's Vengeance, Collected Company and the like, but I feel like we would just combat those through the use of a counterspell suite.
That then leaves us with it combatting Aether Vial and cards that bring themselves back with their own effects, like Bloodghast, and that seems a little narrow for my liking.
It won't work against Aether Vial completely. Because of the nature of the timing, you would have to sac Mistcaller before they decide if they will put a creature into play or not. You can still do it to stall them, but you wont get them as hard as you'd like.