Displacement Wave #55
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Return all nonland permanents with mana value X or less to their owners' hands.
“The sea respects no boundaries, least of all the coast.”
Illustrated by Seb McKinnon
Rulings (2)
Jun 22, 2015
A token has mana value 0 unless it's a copy of something else, in which case it has the mana cost of whatever it's copying.
Jun 22, 2015
If a permanent has an 
in its mana cost, that X is 0.