First is all the mass land destruction: Even mass destroyers of land types apply: Contamination and Infernal Darkness probably sit in here somewhere, as do Reality Twist and Hall of Gemstone Cards which make it more difficult for players to cast all their spells certainly go here as well
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Then when you're ready to cast the card, you can simply tap this land to return it to your hand at instant speed
There are 57 cards in the main deck
cards, the value of Shadow Imprisoning Mirror depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Magnificent Mavens)
I'll admit, I misread this at first, thinking you can only copy something with mana value equal to X, but it is worded in a manner that you count the blue mana in it's cost as well