Common Courtesy
Prix
Enchantment
Common Courtesy
Mana
{2}{U}{U}
Oracle text
Whenever a player casts a spell without asking your permission while casting it, counter that spell. When a player asks you permission to cast a spell and you refuse, counter that spell and sacrifice this enchantment.
CommanderModernPioneerStandardLegacyVintagePauper
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Rulings officiels (1) · Scryfall
2020-02-29
You do have to ask yourself permission to cast spells, although you can give yourself a one-time permission that applies to all future spells you cast.