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I've got your leader here

The only way to acquire Korean or Russian boxes en masse would be to be in South Korea or Russia yourself, or hope that your LGS stocks them or is willing to order them for you using whatever limited allocation Wizards gave them

Leave this one alone

Being able to go find any card from your deck whenever you want instead of waiting to draw it can help you assemble the pieces to a game-winning play

That is both incredibly unfun and much more difficult to answer than the other creatures in this discussion, including the ones still on the ban list

This includes creatures like Rabid Wombat, Champion of the Flame, Evershrike, Graceblade Artisan, Kor Spiritdancer, and Uril, the Miststalker