Cresting Mosasaurus operates more like a sea monster (leviathan, octopus, kraken, or serpent) than a dinosaur, since it's a big monster that sends creatures back to your opponents' hand
It starts getting good once you're drawing 2+ cards a turn, though it's unlikely to draw 5+ card due to its restrictions since Aura decks don't easily Go Wide and there's no super efficient way to create an army of enchantment creatures outside of cheating with Enchanted Evening
Wizards had come up with exile, then return effects (a.k.a
Ultimates matter very little as they are so rarely used, returning to Elspeth who is one of the best walkers in Magic yet has one of the worst ultimates paints this picture well
Borderless Source Material Cards We're bringing your favorite episodes of Avatar: The Last Airbender to Magic cards
Supreme Verdict was one of the key cards to a nasty control deck from Return to Ravnica Standard that relied on board wipes and Sphinx's Revelation to own the board