Urza, Prince of Kroog buffs our artifact creatures by +2/+2 and has an expensive activated ability for that can copy an artifact we control and has great combo potential
Without Bargain, Torch the Tower is passable as a Shock spell, but if the player has spare Bargain fodder from Celebration-oriented cards like Hopeful Vigil or various Roles, then Torch the Tower becomes a better Lightning Bolt, which is saying a lot and lets the card scale up a bit in the mid-game
Innistrad basic lands also appear in packs but are not considered part of the set
Hes a tutor in the command zone that can tutor for a combo piece: Helm of the Host
It also makes for a decent sideboard card if the sizing/matchup seems right for it
200 sleeves are the perfect count to sleeve up two Commander decks or two, 75-card decks for other Constructed formats, like Standard and Pioneer