Prism Ring 
Artifact
$0.34 #8817 0.22 11.3 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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Diamond Mare100%
$0.16↓#74240.00↓8.3 years↓
"Whenever you cast a spell of the chosen color, you gain 1 life."
+1 more matching line
Jeweled Torque94%
$0.24↓#30466↓0.2527.0 years↑
"As this artifact enters, choose a color."
+1 more matching line
Diamond Knight93%
$0.30↓#15130↓0.11↓7.3 years↓
"As this creature enters, choose a color."
+1 more matching line
Hall of Triumph91%
$0.37↑#11470↓0.00↓12.5 years↑
"As this card enters, choose a color."
Tablet of the Guilds90%
$0.33↓#89660.00↓14.0 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%
$0.33↓#21614↓0.05↓18.5 years↑
"As this creature enters, choose a color."
Paradise Plume90%
$0.19↓#11150↓0.00↓20.0 years↑
"As this artifact enters, choose a color."
+1 more matching line
Caged Sun86%
$3.88↑#948↑0.57↑15.4 years↑
"As this artifact enters, choose a color."
Heraldic Banner86%
$0.26↓#850↑0.00↓7.0 years↓
"As this artifact enters, choose a color."
Seal of the Guildpact84%
$0.36↑#12537↓0.1410.9 years
"As this artifact enters, choose two colors."
Gauntlet of Power82%
$3.80↑#2627↑0.2020.0 years↑
"As this artifact enters, choose a color."
Contemplation78%
$0.27↓#20942↓0.2428.6 years↑
"Whenever you cast a spell, you gain 1 life."
Throne of Eldraine78%
$29.41↑#897↑0.283.1 years↓
"As this card enters, choose a color."
Setessan Battle Priest78%
$0.06↓#27390↓0.2913.1 years↑
"Whenever you cast a spell that targets this creature, you gain 2 life."
Student of Ojutai76%
$0.05↓#18033↓0.2411.6 years
"Whenever you cast a noncreature spell, you gain 2 life."
Lifesmith76%
$0.18↓#30421↓0.07↓16.1 years↑
"Whenever you cast an artifact spell, you may pay . If you do, you gain 3 life."
. If you do, you gain 3 life."
Dawnhart Geist75%
$0.14↓#17966↓0.06↓4.9 years↓
"Whenever you cast an enchantment spell, you gain 2 life."
Doomskar Oracle73%
$0.17↓#19561↓0.00↓5.7 years↓
"Whenever you cast your second spell each turn, you gain 2 life."
Lullmage's Familiar72%
$0.09↓#21118↓0.00↓6.1 years↓
"Whenever you cast a kicked spell, you gain 2 life."
The Prismatic Piper72%
$0.09↓#28443↓0.205.9 years↓
"If this card is your commander, choose a color before the game begins. this card is the chosen color."