If the front face of the card is a creature card, you can turn it face up by paying its mana cost
While players might mourn the loss of certain fan-favorite cards (Sisu Empowered Sibling comes to mind!), Fabled brings plenty of new cards to be excited about
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Sometimes this is your commander, like Depala, Pilot Exemplar or Rashmi, Eternities Crafter, but it's also Verdurous Gearhulk or a timely Stunt Double to copy your opponent's biggest monster
Covenant is also a fine sweeper-style effect in a multicolor control deck, with many EDHREC users slotting it into decks playing mana creatrues, counterspells, and other staples like Rhystic StudyRhystic Study, Esper SentinelEsper Sentinel, and Cyclonic RiftCyclonic Rift
Mutavault, the best creature land in Magic, is the most prominent of these