Cipher is a pet favorite of mine, and the arcane spell type associated with spirits is another weird relic from the past
Even if Vivi isn't on the battlefield, your creatures help to make up the difference by providing token creatures or excess mana generation to make it easier to cast multiple spells a turn
You can still get the extended art versions very cheaply
You can drop a land tapped (any land), tutor a dork, exile like a better Naturalize artifacts or enchantments to perma-answer stuff or grow with a counter and pseudo-fight as removal too
Chance for Glory Have you ever been in a situation where beating a board wipe and then having just one more turn would allow you to win a close game of Commander
More importantly, OP-03 played a major role in shaping early competitive decks, which adds historical value even when cards are no longer tournament staples