Brineborn Cutthroat 
Creature — Merfolk Pirate
$0.17 #10386 0.12 7.3 years
Flash (You may cast this spell any time you could cast an instant.)
Whenever you cast a spell during an opponent's turn, put a +1/+1 counter on this creature.
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Cards similar to Brineborn Cutthroat expected a card that isn't here?
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"Whenever you cast your first spell during each opponent's turn, put a +1/+1 counter on this creature."
Nymris, Oona's Trickster92%
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"Flash"
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"Whenever you cast a spell during an opponent's turn, you get an experience counter."
Wavebreak Hippocamp82%
$0.61↑#2440↑0.27↑6.7 years
"Whenever you cast your first spell during each opponent's turn, draw a card."
Satyr Hoplite82%
$0.13↓#21251↓0.0712.5 years↑
"Whenever you cast a spell that targets this creature, put a +1/+1 counter on this creature."
Setessan Oathsworn82%
$0.16↓#23889↓0.1112.7 years↑
"Whenever you cast a spell that targets this creature, put two +1/+1 counters on this creature."
Pheres-Band Thunderhoof82%
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"Whenever you cast a spell that targets this creature, put two +1/+1 counters on this creature."
Staunch-Hearted Warrior82%
$0.03↓#28363↓0.00↓13.1 years↑
"Whenever you cast a spell that targets this creature, put two +1/+1 counters on this creature."
Lagonna-Band Trailblazer82%
$0.12↓#21221↓0.0612.5 years↑
"Whenever you cast a spell that targets this creature, put a +1/+1 counter on it."
Fabled Hero82%
$0.29↑#19015↓0.00↓13.1 years↑
"Whenever you cast a spell that targets this creature, put a +1/+1 counter on it."
Centaur Battlemaster82%
$0.07↓#26566↓0.0613.1 years↑
"Whenever you cast a spell that targets this creature, put three +1/+1 counters on this creature."
War-Wing Siren81%
$0.06↓#28251↓0.00↓12.5 years↑
"Whenever you cast a spell that targets this creature, put a +1/+1 counter on this creature."
Akroan Skyguard81%
$0.13↓#19676↓0.00↓12.7 years↑
"Whenever you cast a spell that targets this creature, put a +1/+1 counter on this creature."
Thunder Drake80%
$0.10↓#21133↓0.067.5 years
"Whenever you cast your second spell each turn, put a +1/+1 counter on this creature."
Illvoi Operative80%
$0.11↓#19719↓0.00↓1.2 years↓
"Whenever you cast your second spell each turn, put a +1/+1 counter on this creature."
Boar-q-pine80%
$0.10↓#14720↓0.00↓0.9 years↓
"Whenever you cast a noncreature spell, put a +1/+1 counter on this creature."
Dawnbringer Charioteers80%
$0.26↑#22564↓0.00↓12.5 years↑
"Whenever you cast a spell that targets this creature, put a +1/+1 counter on this creature."
Mage Tower Referee80%
$0.11↓#23626↓0.01↓0.5 years↓
"Whenever you cast a multicolored spell, put a +1/+1 counter on this creature."
Blessed Spirits80%
$0.13↓#21006↓0.1511.3 years↑
"Whenever you cast an enchantment spell, put a +1/+1 counter on this creature."