Obviously, X-spells were great mana sinks, but artifacts with healthy activation costs were also big-time favorites, and Mishras Factory was a potent buy-out for those spots where you needed to Mana Drain but had nothing to use it on, plus nothing on top of your deck
We lose two and get the Demon, they lose eight and get a weenie
Playing against a red deck, the game drags out and your opponent casts Outpost Siege, naming Khans
Its going to be $10, like Jadelight Ranger was) Sell six months before rotation: Carnage Tyrant, History of Benalia Buy when it rotates and is cheapest: Mox Amber (going to get broken at some point, already ticking up in Commander), The Immortal Sun
High-Society Hunter High-Society Hunter is a really strong card draw ability and one that almost all black decks want