Whenever a player casts an instant spell, counter it unless that player pays {X}, where X is its mana value.
Legalities
tlrlegal
duellegal
brawlnot legal
pennynot legal
PreDH
Rulings · 2
wotc
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.
wotc
This ability triggers when the spell is cast.
Notes
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