The size of the cardpool (360, 540, and 720 being the most common) and the restrictions on those cards (Power 9 included, amount of mana rocks, Modern legal cards, Uncommons only, etc) vary from Cube to Cube, but the general guiding principles remain the same
Name: Arcane Truth || CSV6
This card is also quick-play, so it can be used on the user's turn or their opponent's turn if it was set the turn prior
(3) Unaffected by non-"Power Patron" monsters' effects
However, taking it all together, Relic is the best of them all since it can constantly exile a card from a graveyard and thus keeping it empty while also being able to exile all graveyards at once and draw a card from it
The price makes it feel more prohibitive, but it also keeps it from being a feature in every MTG Commander deck in existence