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Whenever a player casts an instant spell, counter it unless that player pays 
, where X is its mana value.
Illustrated by Brian Snõddy
Rulings (2)
Oct 4, 2004
This ability triggers when the spell is cast.
Oct 1, 2008
This has the supertype world. When a world permanent enters, any world permanents that were already on the battlefield are put into their owners' graveyards. This is a state-based action called the "world rule." The new world permanent stays on the battlefield. If two world permanents enter at the same time, they're both put into their owners' graveyards.
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