Tideforce Elemental 

Creature — Elemental
$0.32 #14606 0.50 16.7 years
Landfall — Whenever a land you control enters, you may untap this creature.
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Cards similar to Tideforce Elemental 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.
Retreat to Coralhelm92%
$0.41↑#1755↑0.36↓11.0 years↓
"• You may tap or untap target creature."
+1 more matching line
Stone-Seeder Hierophant88%
$0.40↑#10220↑0.16↓21.0 years↑
"Whenever a land you control enters, untap this creature."
+1 more matching line
Vedalken Anatomist88%
$0.10↓#25724↓0.18↓15.7 years
"
,
: Put a -1/-1 counter on target creature. You may tap or untap that creature."
Bounding Krasis88%
$0.14↓#18079↓0.28↓11.3 years↓
"When this creature enters, you may tap or untap target creature."
Scrib Nibblers87%
$0.38↑#155130.24↓16.7 years
"Whenever a land you control enters, you may untap this creature."
Elite Interceptor // Rejoinder86%
$0.21↓#133400.07↓0.5 years↓
"You may tap or untap target creature."
Elven Raft-Steerer86%
$0.25↓#10932↑0.27↓0.2 years↓
"Whenever a land you control enters, choose one —"
+1 more matching line
Teardrop Kami84%
$0.19↓#19212↓0.22↓21.7 years↑
"Sacrifice this creature: You may tap or untap target creature."
Janjeet Sentry82%
$0.08↓#22226↓0.17↓10.1 years↓
"
, Pay 
: You may tap or untap target artifact or creature."