Being a one-mana legendary creature also means she turns on [card]Mox Amber[/card] from turn one, enabling explosive starts where you play Lady Octopus, cast a draw spell, build counters, and immediately cheat an artifact into play
Well, the top colorless Commander staples that are also mythic rares are Mana Crypt, Mana Vault, Sword of Feast and Famine, Wurmcoil Engine, and Crucible of Worlds
While Helga, Skittish Seer is a very strong card, the deck is perfectly functional without it, so even if it gets countered or removed, you have other tools to make sure you can play your spells
That's just so game-breakingly good
Hand them over and theyll price them out and give you your cash
Foils were introduced in Urzas Legacy and 7th Edition , so all the sets before those lack a foil/nonfoil entry