Diamond Knight 
Artifact Creature — Knight
$0.26 #15007 0.08 7.2 years
Vigilance (Attacking doesn't cause this creature to tap.)
As this creature enters, choose a color.
Whenever you cast a spell of the chosen color, put a +1/+1 counter on this creature.
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Cards similar to Diamond Knight expected a card that isn't here?
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"Whenever you cast a multicolored spell, put a +1/+1 counter on this creature."
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"Vigilance"
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"As this card enters, choose a color."
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"As this creature enters, choose a color."
Diamond Mare86%
$0.15↓#7494↑0.29↑8.1 years
"Whenever you cast a spell of the chosen color, you gain 1 life."
+1 more matching line
Prism Ring86%
$0.40↑#8740↑0.0011.1 years↑
"Whenever you cast a spell of the chosen color, you gain 1 life."
+1 more matching line
Jeweled Torque82%
$0.22↓#30264↓0.1326.9 years↑
"As this artifact enters, choose a color."
Heraldic Banner80%
$0.31↑#861↑0.186.9 years
"As this artifact enters, choose a color."
Paradise Plume80%
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"As this artifact enters, choose a color."
Caged Sun80%
$3.73↑#917↑0.64↑15.3 years↑
"As this artifact enters, choose a color."
Mage Tower Referee79%
$0.06↓#23810↓0.000.4 years↓
"Whenever you cast a multicolored spell, put a +1/+1 counter on this creature."
Seal of the Guildpact79%
$0.37↑#123750.29↑10.8 years↑
"As this artifact enters, choose two colors."
Satyr Hoplite78%
$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 Oathsworn78%
$0.14↓#23753↓0.1212.6 years↑
"Whenever you cast a spell that targets this creature, put two +1/+1 counters on this creature."
Pheres-Band Thunderhoof78%
$0.08↓#29215↓0.22↑12.3 years↑
"Whenever you cast a spell that targets this creature, put two +1/+1 counters on this creature."
Staunch-Hearted Warrior78%
$0.03↓#28035↓0.26↑12.9 years↑
"Whenever you cast a spell that targets this creature, put two +1/+1 counters on this creature."
Centaur Battlemaster78%
$0.06↓#26240↓0.32↑12.9 years↑
"Whenever you cast a spell that targets this creature, put three +1/+1 counters on this creature."
Lagonna-Band Trailblazer78%
$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 Hero78%
$0.33↑#18675↓0.33↑12.9 years↑
"Whenever you cast a spell that targets this creature, put a +1/+1 counter on it."
Sisterhood of Karn78%
$0.21↓#121200.31↑2.9 years↓
"Whenever you cast a spell from anywhere other than your hand, double the number of +1/+1 counters on this creature."