Finale of Revelation requires 12+ mana to get all its perks, but that includes untapping some of your lands, shuffling your graveyard into your library, and removing your maximum hand size for the rest of the game
That I attempt to address in the discussion rather more than the ratings alone
Once you hit turn 4 or 5, it upgrades into a 4/5 for no mana investment, allowing it to stay competitive with the creatures that are being cast at that point in the game (Siege Rhino)
Casting it tutors up five different dragons straight into your hand, giving you the perfect setup for mid- or late-game dominance
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(10/2/2025) Even if the cost of the spell or ability that waterbend is part of increases or decreases, you still may only tap artifacts or creatures to pay for costs up to the amount of the generic mana in the waterbend cost