Common Courtesy
Unsanctioned — Uncommon
Enchantment
Sets Common Courtesy has been printed in:

Unsanctioned — Uncommon
Enchantment
Sets Common Courtesy has been printed in:

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Enchantment
At the beginning of your upkeep, flip a coin. If you lose the flip, sacrifice Planar Chaos.
Whenever a player casts a spell, that player flips a coin. If they lose the flip, counter that spell.
Artifact
Whenever a player casts a spell, if no mana was spent to cast it, counter that spell.
, , Sacrifice Vexing Bauble: Draw a card.
Legendary Creature — Human Soldier (3/3)
Vigilance
Whenever an opponent casts a spell, if no mana was spent to cast it, counter that spell.
Sacrifice Boromir, Warden of the Tower: Creatures you control gain indestructible until end of turn. The Ring tempts you.
Enchantment
Whenever an opponent casts a spell, counter that spell and put a depletion counter on Decree of Silence. If there are three or more depletion counters on Decree of Silence, sacrifice it.
Cycling (, Discard this card: Draw a card.)
When you cycle Decree of Silence, you may counter target spell.
Enchantment
When a player casts a spell, sacrifice Hesitation and counter that spell.
Enchantment
Noncreature spells you cast cost less to cast.
Whenever you cast a noncreature spell, counter that spell unless you sacrifice a creature.
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