Arena Trickster 
Creature — Human Shaman
$0.04 #27649 0.05 6.6 years
Whenever you cast your first spell during each opponent's turn, put a +1/+1 counter on this creature.
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Brineborn Cutthroat98%
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"Whenever you cast a spell during an opponent's turn, put a +1/+1 counter on this creature."
Katara, Waterbending Master84%
$8.11↑#6325↑0.000.8 years↓
"Whenever you cast a spell during an opponent's turn, you get an experience counter."
Wavebreak Hippocamp84%
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"Whenever you cast your first spell during each opponent's turn, draw a card."
Akroan Skyguard80%
$0.11↑#19504↑0.29↑12.6 years↑
"Whenever you cast a spell that targets this creature, put a +1/+1 counter on this creature."
War-Wing Siren80%
$0.07↑#279970.29↑12.3 years↑
"Whenever you cast a spell that targets this creature, put a +1/+1 counter on this creature."
Satyr Hoplite80%
$0.13↑#21092↑0.44↑12.3 years↑
"Whenever you cast a spell that targets this creature, put a +1/+1 counter on this creature."
Setessan Oathsworn80%
$0.14↑#237530.1212.6 years↑
"Whenever you cast a spell that targets this creature, put two +1/+1 counters on this creature."
Pheres-Band Thunderhoof80%
$0.08↑#292150.22↑12.3 years↑
"Whenever you cast a spell that targets this creature, put two +1/+1 counters on this creature."
Staunch-Hearted Warrior80%
$0.03↓#280350.26↑12.9 years↑
"Whenever you cast a spell that targets this creature, put two +1/+1 counters on this creature."
Centaur Battlemaster80%
$0.06↑#262400.32↑12.9 years↑
"Whenever you cast a spell that targets this creature, put three +1/+1 counters on this creature."
Lagonna-Band Trailblazer80%
$0.10↑#21066↑0.25↑12.3 years↑
"Whenever you cast a spell that targets this creature, put a +1/+1 counter on it."
Fabled Hero80%
$0.33↑#18675↑0.33↑12.9 years↑
"Whenever you cast a spell that targets this creature, put a +1/+1 counter on it."
Illvoi Operative80%
$0.09↑#19669↑0.131.1 years↓
"Whenever you cast your second spell each turn, put a +1/+1 counter on this creature."
Thunder Drake80%
$0.12↑#20808↑0.29↑7.3 years
"Whenever you cast your second spell each turn, put a +1/+1 counter on this creature."
Boar-q-pine80%
$0.15↑#14751↑0.000.8 years↓
"Whenever you cast a noncreature spell, put a +1/+1 counter on this creature."
Pyroceratops80%
$0.17↑#18322↑0.006.4 years
"Whenever you cast a noncreature spell, put a +1/+1 counter on this creature."
Tempest Angler80%
$0.21↑#7286↑0.062.1 years↓
"Whenever you cast a noncreature spell, put a +1/+1 counter on this creature."
Deeproot Champion80%
$0.30↑#20024↑0.25↑8.9 years↑
"Whenever you cast a noncreature spell, put a +1/+1 counter on this creature."
Mage Tower Referee80%
$0.06↑#238100.000.4 years↓
"Whenever you cast a multicolored spell, put a +1/+1 counter on this creature."
Sprite Dragon80%
$0.36↑#6210↑0.066.4 years
"Whenever you cast a noncreature spell, put a +1/+1 counter on this creature."