If were spending as little time as possible on MTG finance, that means just assuming everything in the set will fall and not worrying about the potential of underpriced cards
If you dont have enough sacrifice fodder, your outlets wont do anything
Kill a giant creature, have Lazav become a copy of it, block, and profit
Creatures with Partner can be used with other Creatures with Partner as one's Commanders, thus breaking a big deckbuilding rule in MTG 's Commander as well as a potential advantage by reducing by one the 99 cards in the deck
That being said, GameStop does offer a few advantages
If you notice theres a huge glut of quality slivers at the two and three mana slot, so when there was non-cumulative redundancy in sliver abilities Id cut from the two and three mana slot in favor of comparable slivers in the other slots