Tidebinder Mage 
Creature — Merfolk Wizard
$0.20 #21453 0.71 13.1 years
When this creature enters, tap target red or green creature an opponent controls. That creature doesn't untap during its controller's untap step for as long as you control this creature.
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Cards similar to Tidebinder Mage expected a card that isn't here?
Reports become test cases the matcher is graded against before an update ships. Delvefall isn't a chatbot guessing, it compares the printed rules text of every card with plain math, and examples like yours decide which differences should count.
Wrath of Marit Lage86%
$0.33↑#241730.7531.3 years↑
"When this enchantment enters, tap all red creatures."
Dungeon Geists86%
$0.12↓#180250.21↓14.6 years↑
"When this creature enters, tap target creature an opponent controls. That creature doesn't untap during its controller's untap step for as long as you control this creature."
Encase in Ice85%
$0.07↓#27708↓0.00↓11.4 years↓
"Enchant red or green creature"
Ray of Frost84%
$0.11↓#235550.57↓5.1 years↓
"When this Aura enters, if enchanted creature is red, tap it."
Controlled Instincts84%
$0.07↓#30429↓0.6117.6 years↑
"Enchant red or green creature"
Hunting Drake82%
$0.12↓#30471↓0.00↓25.6 years↑
"When this creature enters, put target red or green creature on top of its owner's library."
Ty Lee, Chi Blocker81%
$0.47↑#6825↑0.00↓0.8 years↓
"When this card enters, tap up to one target creature. It doesn't untap during its controller's untap step for as long as you control this card."
Homarid Shaman78%
$0.76↑#25777↓0.07↓31.8 years↑
": Tap target green creature."
: Tap target green creature."
Icefall Regent77%
$0.47↑#12998↑0.6511.4 years↓
"When this creature enters, tap target creature an opponent controls. That creature doesn't untap during its controller's untap step for as long as you control this creature."
Sand Squid74%
$0.57↑#25810↓0.41↓26.9 years↑
"
: Tap target creature. That creature doesn't untap during its controller's untap step for as long as this creature remains tapped."
: Tap target creature. That creature doesn't untap during its controller's untap step for as long as this creature remains tapped."
Starlight Snare74%
$0.13↓#204130.25↓1.8 years↓
"When this Aura enters, tap enchanted creature."
Charmed Sleep74%
$0.07↓#15562↑0.25↓6.9 years↓
"When this Aura enters, tap enchanted creature."
Claustrophobia74%
$0.05↓#190770.36↓14.9 years↑
"When this Aura enters, tap enchanted creature."
Sleep Paralysis74%
$0.06↓#230050.88↑10.4 years↓
"When this Aura enters, tap enchanted creature."
Paralyze74%
$0.13↓#205250.57↓33.1 years↑
"When this Aura enters, tap enchanted creature."
Containment Protocol74%
$0.21↑#28751↓0.00↓0.5 years↓
"When this Aura enters, tap enchanted creature."
Capture Sphere74%
$0.05↓#187020.25↓7.9 years↓
"When this Aura enters, tap enchanted creature."
Waterknot74%
$0.12↓#218840.25↓8.6 years↓
"When this Aura enters, tap enchanted creature."
Castaway's Despair74%
$0.09↓#26583↓0.53↓8.9 years↓
"When this Aura enters, tap enchanted creature."
Flashfreeze73%
$0.10↓#202860.15↓20.1 years↑
"Counter target red or green spell."