Overlord of the Hauntwoods If youve touched Standard at all after Duskmourn came out, you know how busted Overlord of the Hauntwoods can be, but it belongs in Commander, too
The answer is If an effect allows you to play a specific modal double-faced card, you may cast it as a spell or play it as a land, as determined by which face you choose to play

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4 | Bloodstained Mire Price: $30.47 In somewhat of a theme for the most expensive land in Modern, Bloodstained Mire is another Fetch Land
One word of caution: I strongly recommend against buying collections sight unseen