Piracy 
Sorcery
$57.45 #20652 0.81 28.3 years
Until end of turn, you may tap lands you don't control for mana. Spend this mana only to cast spells.
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Cards similar to Piracy 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.
Drain Power78%
$3.18↓#16504↑0.7733.2 years↑
"Target player activates a mana ability of each land they control. Then that player loses all unspent mana and you add the mana lost this way."
Geosurge70%
$4.06↓#6161↑0.71↓15.4 years↓
"Add 
. Spend this mana only to cast artifact or creature spells."
. Spend this mana only to cast artifact or creature spells."