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The First Chapter - Amber and Amethyst Best cards: Olaf, Friendly Snowman

And you're right

Companion originally let you cast a single creature from your sideboard if you fit a specific condition, but its immense popularity across every format in the game led to decks needing a Companion to participate

November 2003 Union Effect 2 Monsters 3 Summoned Skull 2 Dark Ruler Ha Des 3 Decayed Commander 3 Des Dendle 1 Injection Fairy Lily 3 Vampire Orchis 1 Yata-Garasu 3 Zombie Tiger Spells 1 Change of Heart 1 Dark Hole 3 Frontline Base 1 Graceful Charity 1 Harpie's Feather Duster 1 Monster Reborn 1 Pot of Greed 1 Premature Burial 1 Raigeki 3 Soul Exchange 1 United We Stand 1 Upstart Goblin Traps 1 Call of the Haunted 1 Jar of Greed 1 Magic Cylinder 1 Mirror Force 1 Trap Hole Union Effect Monsters 3 Another learner deck looking for gems, and I came up empty handed

So, at the moment, there are three types of trainers: Item