The O2 Arena

As long as there are four or more lore counters
among Sagas you control, The O2 Arena 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.