Through gritted teeth I must accept, though, that its still a good bit more complicated that Hearthstone, a game which (secrets aside) doesnt allow you to interrupt another players turn
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The primary upside of this over Howling Mine is obviously that you get to go first, which is kind of like making it a cantrip, but its also worth noting that given the phenomenally clunky nature of spells in Esper Control decks, this might just make a reasonable instant speed threat to play at the end of their turn
Kaya, Intangible Slayers abilities are all very solid, but the -3 is where its at
The new Izzet cards that care about instants and sorceries in exile and your graveyard Beacon Bolt, Crackling Drake, and Ral, Izzet Viceroy play nicely with Outpost Siege-style cards