Lavinia, Azorius Renegade 

Legendary Creature — Human Soldier
$0.27 #3214 1.10 7.7 years
Each opponent can't cast noncreature spells with mana value greater than the number of lands that player controls.
Whenever an opponent casts a spell, if no mana was spent to cast it, counter that spell.
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Vexing Bauble92%
$2.98↑#1297↑0.80↓2.3 years↓
"Whenever a player casts a spell, if no mana was spent to cast it, counter that spell."
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"Whenever an opponent casts a spell, if no mana was spent to cast it, counter that spell."
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$0.39↑#15623↓0.89↓5.5 years↓
"Whenever a player casts a spell, if no colored mana was spent to cast it, counter that spell."
Gaddock Teeg80%
$0.63↑#9576↓1.57↑19.0 years↑
"Noncreature spells with mana value 4 or greater can't be cast."
Sanctum Prelate78%
$0.69↑#9798↓1.22↑10.1 years↑
"Noncreature spells with mana value equal to the chosen number can't be cast."
Ice Cave78%
$0.74↑#21369↓0.82↓25.4 years↑
"Whenever a player casts a spell, any other player may pay that spell's mana cost. If a player does, counter the spell."
Planar Chaos76%
$2.33↑#7172↓1.35↑24.4 years↑
"Whenever a player casts a spell, that player flips a coin. If they lose the flip, counter that spell."
Counterbalance74%
$2.51↑#34141.00↓20.2 years↑
"Whenever an opponent casts a spell, you may reveal the top card of your library. If you do, counter that spell if it has the same mana value as the revealed card."
Lunar Force74%
$0.28↑#21452↓0.35↓10.2 years↑
"When an opponent casts a spell, sacrifice this enchantment and counter that spell."
Chancellor of the Annex74%
$3.18↑#10165↓1.43↑15.4 years↑
"Whenever an opponent casts a spell, counter it unless that player pays
."
Chalice of the Void72%
$16.39↑#9424↓1.1423.0 years↑
"Whenever a player casts a spell with mana value equal to the number of charge counters on this artifact, counter that spell."
Decree of Silence72%
$21.71↑#11742↓1.1623.4 years↑
"Whenever an opponent casts a spell, counter that spell and put a depletion counter on this enchantment. If there are three or more depletion counters on this enchantment, sacrifice it."
Swindler's Scheme70%
$0.18↓#23391↓0.44↓4.5 years↓
"Whenever an opponent casts a spell from their hand, you may reveal the top card of your library. If it shares a card type with that spell, counter that spell and that opponent may cast the revealed card without paying its mana cost."
Nullstone Gargoyle70%
$2.39↑#14992↓1.26↑21.0 years↑
"Whenever the first noncreature spell of a turn is cast, counter that spell."
In the Eye of Chaos70%
$196.62↑#21499↓1.61↑32.4 years↑
"Whenever a player casts an instant spell, counter it unless that player pays
, where X is its mana value."
Nether Void70%
$673.40↑#16326↓2.18↑32.4 years↑
"Whenever a player casts a spell, counter it unless that player pays
."