Your search for "Manifold Key 398" revealed the following:
Manifold Key - Retro Frame (Foil) (TSR) from Time Spiral Remastered, available at 401 Games Canada. Rarity: Rare Finish: Foil Artist: Lake Hurwitz Card Text:1, T: Untap another target artifact.3, T: Target creature can’t be blocked this turn.
Manifold Key - Retro Frame (TSR) from Time Spiral Remastered, available at 401 Games Canada. Rarity: Rare Finish: Normal Artist: Lake Hurwitz Card Text:1, T: Untap another target artifact.3, T: Target creature can’t be blocked this turn.