A cheap removal spell and a mass removal spell in one card, both of which are not what you would call over priced is an exciting control and midrange proposition
Market Price: $17.22 Market Price: $53.91 In particular, the Eldrazi is a decent answer against archetypes that care about ramping into massive threats, as you can draw plenty of cards while chipping away at their library
Rulings 2009-10-01 A face-up plane card that's turned face down becomes a new object with no relation to its previous existence
Most red decks running Koth as their big threat will want to consistently hit their 4th land drop on turn 4, and that means running 24 lands rather than the 20-22 you can sometimes get away with in aggro decks.
Cards from The Big Score are somewhat elusive and expensive though, so I dont see this red creature that often
Stop that Magus of the Wheel or Jaces Archivist from discarding your great hand, shut down your opponents protection plan by paralyzing their Mother of Runes and prevent that Weathered Wayfarer from finding more potentially crucial non-basics