Dispersal Shield 

Instant
$0.16 #17250 0.43 23.4 years
Counter target spell if its mana value is less than or equal to the greatest mana value among permanents you control.
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Reject Imperfection84%
$0.32↑#4771↑0.18↓3.7 years↓
"Counter target spell. If that spell's mana value was 3 or less, proliferate."
Hypnotic Sprite // Mesmeric Glare80%
$0.15↓#5775↑0.06↓7.0 years↓
"Counter target spell with mana value 3 or less."
Accelerated Mutation78%
$0.13↓#25369↓0.00↓23.4 years
"Target creature gets +X/+X until end of turn, where X is the greatest mana value among permanents you control."
Torrent of Fire78%
$0.11↓#28719↓0.05↓23.4 years
"this card deals damage to any target equal to the greatest mana value among permanents you control."
Runescale Stormbrood // Chilling Screech77%
$0.23↑#10162↑0.00↓1.5 years↓
"Counter target spell with mana value 2 or less."
Sound the Trumpets76%
$0.12↓#182780.11↓0.2 years↓
"Counter target spell. If that spell's mana value was 2 or less, recruit."
Prohibit76%
$0.16#22857↓0.07↓26.0 years↑
"Counter target spell if its mana value is 2 or less. If this spell was kicked, counter that spell if its mana value is 4 or less instead."
Spell Swindle74%
$1.58↑#3255↑0.519.1 years↓
"Counter target spell. Create X Treasure tokens, where X is that spell's mana value."
Mystic Genesis74%
$0.16#187230.12↓13.7 years↓
"Counter target spell. Create an X/X green Ooze creature token, where X is that spell's mana value."
Draining Whelk74%
$0.40↑#13413↑0.4420.0 years↓
"When this creature enters, counter target spell. Put X +1/+1 counters on this creature, where X is that spell's mana value."