Certain cards in Magic had become staples of the game and they were important enough that Ice Age couldn't function as a stand-along set without them
Buy smaller quantities of packs until you open what you need, and remember each individual pack you open accumulates wildcards and Golden Pack progress (for the most recent sets)
Its a 3/3 nightmare insect, and when it enters the battlefield, you distribute ability counters to creatures you control for each of those abilities that exist on creatures in your graveyard
Wargamer has a whole separate guide to the best MTG commander precon decks if you just want to get involved with the game without any fuss or worries about the secondary market
Urzas Cave Busted in Commander, Urza's Cave seems tempting in some kind of The Enigma Jewel deck, which is barely fringe in Standard, much less Modern
An aristocrats theme where youre using your Slug tokens as cannon fodder for your sacrifice outlets could also work