While it's only a basic counterspell at its worst, this card's power comes from the ability to use it as a mana sink in the late game for both card advantage and copying your best creatures
Mill decks will definitely be including this Jace Variant, as its ultimate ability is too tempting and hilariously mean to resist, and counter manipulation via Proliferate makes it that much easier to activate
Event Cards Event cards are disposable cards that can have an immediate impact on the game
All those Treasure, Blood, Clue, Food, Map, and Powerstone tokens you picked up along the way can now become fresh cards once you no longer need them
Oh, and I should leave mana up to counter any copies of spells I might've exiled as well, too
Cheap datacenter proxies from no-name providers are one step above free