Mewtwo consistently ranks among the top Pokemon due to its overwhelming power in the original Game Boy game
She comes in swinging, potentially growing to a 5/5 or bigger, and winding back time for you to enjoy those big abilities one last time
Artifact mana rocks blue pairs naturally with artifacts and runs efficient rocks like Sol Ring, Sapphire Medallion, and Sky Diamond High Tide and burst mana spells that temporarily double or multiply mana from Islands enable explosive combo turns Untap synergies Dramatic Reversal, Turnabout, and Freed from the Real convert mana rocks and dorks into repeated acceleration Cost reduction effects like Baral, Chief of Compliance and Sapphire Medallion function as pseudo-ramp by making your spells cheaper Card advantage as ramp blue's deep card draw finds land drops and mana rocks more consistently than other colors Building a Blue Ramp Package Mono-blue decks should lean heavily on 2-mana rocks (8-10 pieces minimum) since blue lacks natural land acceleration

That last one is a particularly odd choice given its only shown up on a single card after its initial introduction in 2008's Shadowmoor block, but Heggen says it was explicitly used as a visual joke here: the symbol looks like the quarter-circle joystick motion required to do Ryus Hadoken ability in the video games
If you exiled a nonland card this way, create a Treasure token