The Pokmon TCG, much like the show, isnt really subject to the same rules as the mainline games
The first serialized cards were the Retro Frame artifacts in The Brothers War, a subset abbreviated BRR
The second big flaw I find in Spell Snare is that it serves very little specific purpose in the cube, you never play it really to deal with something generic as you might with a Disenchant or Negate effect
Boy howdy are there a lot of good elves: the tribal synergy in ramp alone is good enough that they get played where other decks would play rocks, and theres more than that up their pointy-eared sleeves
This is going to be a key common to pick up when you draft the green/white web-slinging deck, and I cant imagine theres any number of these that youd be unhappy to play in your deck
Legendary Creature - Dragon Zombie Color tag templates(None) Blast-Furnace Hellkite Artifact offering (You may cast this spell as though it had flash by sacrificing an artifact and paying the difference in mana costs between this and the sacrificed artifact