Prism Ring 
Artifact
$0.40 #8740 0.00 11.1 years
As this artifact enters, choose a color.
Whenever you cast a spell of the chosen color, you gain 1 life.
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Cards similar to Prism Ring expected a card that isn't here?
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Diamond Mare100%
$0.15↓#74940.29↑8.1 years↓
"Whenever you cast a spell of the chosen color, you gain 1 life."
+1 more matching line
Jeweled Torque94%
$0.22↓#30264↓0.13↑26.9 years↑
"As this artifact enters, choose a color."
+1 more matching line
Diamond Knight93%
$0.26↓#15007↓0.087.2 years↓
"As this creature enters, choose a color."
+1 more matching line
Hall of Triumph91%
$0.44↑#11172↓0.29↑12.4 years↑
"As this card enters, choose a color."
Tablet of the Guilds90%
$0.52↑#91180.25↑13.9 years↑
"Whenever you cast a spell, if it's at least one of the chosen colors, you gain 1 life for each of the chosen colors it is."
+1 more matching line
Lurebound Scarecrow90%
$0.32↓#21131↓0.0018.3 years↑
"As this creature enters, choose a color."
Paradise Plume90%
$0.20↓#10973↓0.0019.9 years↑
"As this artifact enters, choose a color."
+1 more matching line
Heraldic Banner86%
$0.31↓#861↑0.18↑6.9 years↓
"As this artifact enters, choose a color."
Caged Sun86%
$3.73↑#917↑0.64↑15.3 years↑
"As this artifact enters, choose a color."
Seal of the Guildpact84%
$0.37↓#12375↓0.29↑10.8 years
"As this artifact enters, choose two colors."
Gauntlet of Power82%
$3.22↑#2556↑0.43↑19.9 years↑
"As this artifact enters, choose a color."
Contemplation78%
$0.24↓#20894↓0.64↑28.5 years↑
"Whenever you cast a spell, you gain 1 life."
Throne of Eldraine78%
$28.44↑#878↑0.25↑3.0 years↓
"As this card enters, choose a color."
Setessan Battle Priest78%
$0.04↓#27041↓0.20↑12.9 years↑
"Whenever you cast a spell that targets this creature, you gain 2 life."
Lifesmith77%
$0.10↓#30093↓0.47↑15.9 years↑
"Whenever you cast an artifact spell, you may pay . If you do, you gain 3 life."
. If you do, you gain 3 life."
Student of Ojutai76%
$0.05↓#17672↓0.18↑11.4 years
"Whenever you cast a noncreature spell, you gain 2 life."
The Prismatic Piper76%
$0.10↓#28212↓0.47↑5.8 years↓
"If this card is your commander, choose a color before the game begins. this card is the chosen color."
Dawnhart Geist75%
$0.17↓#17696↓0.29↑4.8 years↓
"Whenever you cast an enchantment spell, you gain 2 life."
Doomskar Oracle74%
$0.14↓#19343↓0.005.6 years↓
"Whenever you cast your second spell each turn, you gain 2 life."
Lullmage's Familiar72%
$0.10↓#20720↓0.60↑5.9 years↓
"Whenever you cast a kicked spell, you gain 2 life."