Boromir, Warden of the Tower 
Legendary Creature — Human Soldier
$4.45 #874 0.64 3.3 years
Vigilance
Whenever an opponent casts a spell, if no mana was spent to cast it, counter that spell.
Sacrifice Boromir: Creatures you control gain indestructible until end of turn. The Ring tempts you.
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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."
Lavinia, Azorius Renegade90%
$0.27↓#3214↓1.10↑7.7 years↑
"Whenever an opponent casts a spell, if no mana was spent to cast it, counter that spell."
Void Mirror89%
$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."
Dauntless Escort80%
$0.18↓#8127↓0.21↓17.5 years↑
"Sacrifice this creature: Creatures you control gain indestructible until end of turn."
Selfless Spirit80%
$0.48↓#593↑0.29↓10.2 years↑
"Sacrifice this creature: Creatures you control gain indestructible until end of turn."
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."
Rangers of Ithilien76%
$0.24↓#16278↓0.44↓3.3 years
"Vigilance"
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."
Lunar Force75%
$0.28↓#21452↓0.35↓10.2 years↑
"When an opponent casts a spell, sacrifice this enchantment and counter that spell."
Hajar, Loyal Bodyguard74%
$0.66↓#4704↓0.20↓3.9 years
"Sacrifice this card: Legendary creatures you control get +1/+0 and gain indestructible until end of turn."
Counterbalance74%
$2.51↓#3414↓1.00↑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."
Guardian of Faith74%
$0.62↓#1926↓0.41↓5.2 years↑
"Vigilance"
Selfless Savior74%
$0.32↓#3093↓0.23↓6.3 years↑
"Sacrifice this creature: Another target creature you control gains indestructible until end of turn."
Chancellor of the Annex74%
$3.18↓#10165↓1.43↑15.4 years↑
"Whenever an opponent casts a spell, counter it unless that player pays 
."
."
Taranika, Akroan Veteran74%
$0.25↓#15578↓0.14↓6.7 years↑
"Vigilance"
Nix73%
$0.98↓#25782↓0.06↓19.5 years↑
"Counter target spell if no mana was spent to cast it."
Spectacular Spider-Man72%
$5.08↑#3066↓0.29↓1.1 years↓
", Sacrifice this card: Creatures you control gain hexproof and indestructible until end of turn."
, Sacrifice this card: Creatures you control gain hexproof and indestructible until end of turn."
Resolute Watchdog72%
$0.31↓#8343↓0.00↓7.7 years↑
", Sacrifice this creature: Target creature you control gains indestructible until end of turn."
, Sacrifice this creature: Target creature you control gains indestructible until end of turn."
Frodo, Adventurous Hobbit72%
$0.27↓#4785↓0.35↓3.3 years
"Vigilance"
Decree of Silence72%
$21.71↑#11742↓1.16↑23.4 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."