With truly mesmerizing artwork and set design, Urzas block is a style standout, and is likely one of the best sets of all time simply from a gameplay standpoint (broken artifact-based combo decks notwithstanding)
Oketras Monument: The token even has vigilance

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It's an amazing option for a tempo strategy where it kills quickly if you have some bounce or tap effects in your deck, and it works with auras, equipment, and pretty much everything in the game of Magic
Serrated Arrows were playable for the same basic reason that Aeolipile, Nevinyrral's Disk, or Quicksand were playable
This damage can add up quickly in the early game if not stopped