Stinging Lionfish 
Enchantment Creature — Fish
$0.12 #14209 0.19 6.6 years
Whenever you cast your first spell during each opponent's turn, you may tap or untap target nonland permanent.
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Cards similar to Stinging Lionfish expected a card that isn't here?
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Component Collector84%
$0.10↓#25762↓0.254.9 years↓
"Whenever day becomes night or night becomes day, you may tap or untap target nonland permanent."
Giant-Sized Flying Ant82%
$0.12#23448↓0.00↓0.2 years↓
"• Untap target nonland permanent."
Gadwick, the Wizened78%
$0.37↑#6493↑0.53↑6.9 years
"Whenever you cast a blue spell, tap target nonland permanent an opponent controls."
Merrow Reejerey70%
$0.27↑#3995↑0.2618.9 years↑
"Whenever you cast a Merfolk spell, you may tap or untap target permanent."
Tidal Force70%
$0.51↑#167150.1312.8 years↑
"At the beginning of each upkeep, you may tap or untap target permanent."
Hyperion Blacksmith70%
$2.15↑#31613↓0.2632.3 years↑
"
: You may tap or untap target artifact an opponent controls."
: You may tap or untap target artifact an opponent controls."