If your deck is artifact-heavy, then Trading Post is a great choice since you can sacrifice the copy to return an artifact card from your graveyard to your hand, and if the copy happens to be an artifact creature, you can sacrifice it to draw a card, which will let you go up on cards from the transaction
This Izzet commander pairing clearly want to play in some sort of halfway build between being spellslinger and superfriends, as each of their ultimate abilities let you copy any instants and sorceries or activated abilities (which includes loyalty abilities)
I suspect that the upcoming Mythic Championship will change that, however, and well get into the nitty-gritty of that in next weeks column
I immediately scored a few big hits with a foil Demonic Tutor in the collector box and a set foil Mind's Desire in one of the set boxes
(And keep in mind that instants, sorceries, and enchantments that create tokens don't count for this.) If you're going to go tribal, make sure you're taking full advantage of the tribal cards you're working to play