A noncreature permanent that turns into a creature can attack, and its {T} abilities can be activated, only if its controller has continuously controlled that permanent since the beginning of their most recent turn. It doesn't matter how long the permanent has been a creature.
After the triggered ability resolves, Opal Guardian is no longer an enchantment.
Guardian's effect doesn't wear off.
Last observed on Scryfall 2 months ago at $0.23. Over the trailing 90 days the price moved between $0.02 and $0.23 across 49 observations. Cross-checked across TCGplayer, eBay sold, Cardmarket EU, and Star City.
This printing is one of 3 catalogued treatments from TSP — the lineup includes Foil and Nonfoil alongside the standard finish. Across our catalog the Rarix library tracks every variant in the same family so collectors can compare price, scarcity and demand inside a single lineage.
Card #30 of *Time Spiral*, the set that shipped alongside the October 2006 Time Spiral release.
Card type: Enchantment, color identity white, printed at rare. Rares occupy the bottom-of-pack rare slot in standard boosters. Mana cost: {W}{W}{W} (3 converted).
Legal in Modern, Legacy, Vintage, and Commander.
EDHrec ranks this card #29,580 in Commander, putting it in the fringe-play tier of the format's playable pool.
Illustrated by Christopher Rush. Rarix catalogs 542 other cards credited to this artist.
Magic: The Gathering · ™ & © Wizards of the Coast · Illus. Christopher Rush
Card data via Scryfall. Rarix is fan-made; not endorsed by the rights holders.
A face-down creature spell will cause Opal Guardian's ability to trigger (if it's an enchantment).
