What is its total cost
Exiling cards makes creatures like Soulherder and Hero of Breatgard stronger
Anyway, it's amazing it took us as long as we did to get the fixed version - though, truthfully, I imagine advanced players prefer Oblivion Ring for the additional but unintuitive patterns that show up around it
A 2/1 for two is already fine, and if Naban, Dean of Iteration draws you two or three extra cards over the course of the game, you've already built yourself a blue version of Dark Confidant, so perhaps there is more potential here than it looks at first glance
And if we just look at Black & White onwards, regular Mewtwo cards increased by 8.3% while 2-prize Mewtwo cards have increased 35.3%
Khans allows you to exile the top card of your library and play it until the end of your turn, while Dragons allows you to deal one damage to any target when one of your creatures leaves the battlefield