Mind Grind costs X and one Blue and one Black, and it reads, Each opponent reveals cards from the top of their library until they reveal X land cards, then puts all cards revealed this way into their graveyard
Sets that contain the Trainer Gallery have a chance of containing 2 hits per pack, since the Trainer Gallery card can be pulled from the reverse holo slot in the pack
Actually, why bother exporting
This is often fine, one loot can be all you need and having a Jace Telepath Unbound in play afterwards is a much better deal than you get with other comparable discard outlets such as Heir of Falkenrath
In match ups where you don't need a board wipe, you can cycle Sweltering Suns away for a more effective card
If you can afford to do so, of course