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The frostbitten 1995 Magic: The Gathering expansion — snow-covered lands, the punishing "cumulative upkeep" mechanic, and 383 cards of an ice-locked world. It was the first Magic expansion you could play with no other product, and it launched the game's first named block.
The third Magic core set — the white-bordered 1994 reprint, famous for its washed-out, pale printing. With around 500 million cards produced, Revised was the set that finally put Magic on shelves everywhere, and the one most early players actually opened.
The magazine that told you what your Magic cards were actually worth. Scrye was the price-guide bible of the trading-card-game boom — the fold-out list of secondary-market values you scoured to see if your rare was your ticket to riches.