Magic: The Gathering FINAL FANTASY Commander (FIC) and FINAL FANTASY Through the Ages (FCA) are Commander-, Legacy-, and Vintage-legal sets, and individual cards are also legal where already available in other formats
Rest in Peace, Containment Priest, Relic of Progenitus, Nihil Spellbomb, and their ilk will shut you down hard, so keeping at least 1 piece of spot removal for these on hand should be a priority
Following this damage, the player flips a coin
I'm not sure, but I'd bet this was the first scry card designed that played off the converted mana cost of the top card of the library
The high build-around requirements make it hard to throw it to the top of the list, but its undeniably iconic and can finish a game in one swoop
This series then continued as a set of four decks released each year from 1997 to 2004