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Hero's Blade could make the cut in sealed, since it's not an awful card without legends (but is much better with them)

1 One for One Trap Cards 1 Solemn Judgment 1 Double Magic Arm Bind 1 Red-Eyes Spirit Extra Deck 3 Red-Eyes Black Dragon Sword 1 Goddess Bow 1 Rocket Hermos Cannon 1 Time Magic Hammer 1 Flame Swordsman 2 Red-Eyes Metal Flare Dragon 1 Number 11: Big Eyes 1 Abyss Dweller 1 Dark Rebellion Xyz Dragon 1 Castel, the Skyblaster Musketeer 1 Lavalval Chain 1 Evilswarm Exciton Knight

Doubly so when you consider the high chance of additional Chocobo cards as spoilers continue

While it's a Fusion Monster by card type, its effect equips itself to a Monster as soon as you summon it, effectively making it an Equip Spell card that you need to fuse to use

The most valuable cards in Gym Heroes exceed Tentacruel by a wide margin, and this card is available at affordable prices, depending on the condition