That probably wont stop that collector from sneaking it into their next game though
ILLUSTRATOR Howard Lyon LEGALITIES Standard Future Historic Timeless Gladiator Pioneer Modern Legacy Pauper Vintage Penny Commander Oathbreaker Standardbrawl Brawl Competitivebrawl Alchemy Paupercommander Duel Oldschool Premodern Predh Tlr LANGUAGES DE EN ES FR IT JP PT RU ZH-CN ZH-TW RULINGS 2008-08-01 Although Dream Thief says it looks for "another blue spell," there's no requirement that Dream Thief actually be cast as a spell (or be blue) for this part of its ability to work
negate that target's attack, and if you control any face-up Fish, Sea Serpent, or Aqua-Type monsters, inflict 800 damage to your opponent for each of those monsters
Yes, it may go for $200 on average, but the impressive thing is that a moderately played (MP) version of this card sells for about $90, which is more than the Base Set 2 version of Venusaur
Upheaval One of the cheaper cards on the list and the only one that doesn't actually do anything proactive for you