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While it can help if your opponent is on a strategy that involves Fire Energy (with notable examples at the time including Eevee Grove Flareon ex and Shining Revelry Charizard ex), it is otherwise completely useless
Irenicus's Vile Duplication works best with decks that care about instants and sorceries and/or ones that have a commander that benefits from evasion, like Kalamax, the Stormsire
A Gaeas Cradle might show a $400 difference, while a recent Standard staple like The Meathook Massacre might show little difference
That made good answers hard to come by while the Sliver deck was functioning as intended, as winning combats was hard, winning them quickly without trample was even harder, and removal was temporary
This two mana artifact enters tapped, it doesnt untap on your untap step, and at the start of your turn you can choose to skip your turn, untapping the Time Vault