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The advice for buying and selling singles, then, stays the same as always

You still cast these cards even if you do not pay the mana value on the card (if there is one), which means the cascade mechanic still fires off

Cards like Timetwister, Bazaar of Baghdad, The Tabernacle At Pendrell Vale, and Mishra's Workshop all come to mind

Steel Overseer can grow all of our artifact creatures, like Sharding Sphinx, Myr Battlesphere, and Kappa Cannoneer

Call to the Kindred seems like the perfect fit for a deck like this provided you can make it around to your next turn with it still enchanting one of your Slivers

Sure, Ashiok can dominate the game and be an effective turn 3 kill if landed on an empty board early enough, but unlikely other Planeswalkers, it can also be quite effective played on the late game hammer, where not even Spell Pierce can answer it