Theres a lot of potential here
However, its effect is good enough to provide an extra annoyance for the opponent to deal with
But you also missed a few: Aggression, Alexi, Zephyr Mage, Archangel of Strife, Azure Mage, Blood Cultist, Crossway Vampire, Deathless Angel, Elven Cache (6th edition), Fishliver Oil (9th edition), Game of Chaos (5th edition), Inkfathom Infiltrator, Jasmine Boreal, Juniper Order Advocate, Mortiphobia, Remembrance, Snuff Out (duel decks), Sylvan Ranger (M11), Tormented Angel, Vine Trellis, Vitalizing Cascade
Although he believes the cards value could climb further, James says the decision to sell came down to timing
If a Trap Card is played, it will remain on the field until a condition specified on the card is met, causing it to activate automatically