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To put it lightly, this is not something you want to face off against

Put that card into your hand.

Facebook definitely has plenty of traffic and your stuff will sell, however, you may have to relist your items often to ensure you're getting eyes on your listing

Because you're focused on developing a one threat at any time, however, you're particularly vulnerable to targeted removal such as Swords to Plowshares, which can undo all the work you've done for 1 mana at instant speed

Sure you won't always hit cards of mana value 6 or better, but it's a pretty good mana sink

Some of my other favorites are Reliquary Tower, Rogues Passage, Maze of Ith, Scavenger Grounds, etc