This is due to the way their effects are worded: they tell the player to search their library for a basic land type, like a forest or mountain, then put it into play
Sadly, this high price point is largely due to the cards rarity from being a Secret Lair card
By using something like a Voltaic Key or other permanent that untaps another permanent, you can repeatedly take extra turns without giving up a turn
Ferrous Lake Steel Mentor: I couldn't quite figure which location this was supposed to represent from the games, but it seems to be referring to the origins of Super Mutants in Appalachia, with Vault Tec infecting the water supply of several towns with FEV and watching as said towns transformed slowly into Mutants before clearing them out and starting over
Experience Magic:TheGathering at its finest with the UltraProCommanderSeries5Playmat
This culminated three years ago in a two part series I did on my Tumblr blog about the design of the Magic card frame: one looking at Eighth Edition through Rise of the Eldrazi and the other Scars of Mirrodin through Battle for Zendikar