Tom Bombadil is a mythic Legendary Creature — God Bard card from The Hobbit Commander (HOC), collector number 38. Current market price: $8.64 (foil $10.89), TCGplayer market prices via Scryfall.
As long as there are four or more lore counters among Sagas you control, Tom Bombadil has hexproof and indestructible. Whenever the final chapter ability of a Saga you control resolves, reveal cards from the top of your library until you reveal a Saga card. Put that card onto the battlefield and the rest on the bottom of your library in a random order. This ability triggers only once each turn.