Loki, God of Stories

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.