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For three mana you can call in another Knight (also with vigilance, notably), and for one mana you can tap some of your other Knights to remove a threat on the board

Field of Ruin: Needed land destruction to keep greedy manabases in check.

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Having to exile an increasing number of cards for every time you cast it is extremely risky because you might be taking extremely important resources away from yourself

Read more If you want to read up on the topic as a introduction, you can read this (older) but interesting article by wizards them self can be found here