Several factors influence Twilight Masquerade card values: card condition (mint cards worth 3-5x more), rarity (holographic and rare cards command higher prices), first edition status, PSA/BGS grading scores, and market demand for specific Pokemon
So, with that in mind, here are five Umbreon cards that I think are better than the legendary Moonbreon
You cannot Special Summon monsters, except monsters that cannot be Normal Summoned/Set, the turn you activate this effect
Once Ravenous Tarantula has been summoned, all monsters on the player's side of the field gain attack and defense points equal to the difference between the two player's life points
Thankfully, Legacy aficionado Ian Degraff suggested Horizon Canopy, and it tested out so well that there was immediately some testing about a second Horizon Canopy, and also a discussion of shifting to 21 lands