Mana Short 
Instant
$0.43 #15558 1.27 33.2 years
Tap all lands target player controls and that player loses all unspent mana.
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Cards similar to Mana Short 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.
Power Sink84%
$0.15↓#9777↑1.12↓33.2 years
"Counter target spell unless its controller pays 
. If that player doesn't, they tap all lands with mana abilities they control and lose all unspent mana."
. If that player doesn't, they tap all lands with mana abilities they control and lose all unspent mana."
Gulf Squid78%
$0.14↓#27581↓0.50↓26.4 years↓
"When this creature enters, tap all lands target player controls."
Early Frost76%
$0.13↓#25566↓0.59↓22.4 years↓
"Tap up to three target lands."
Drain Power76%
$3.18↑#165040.77↓33.2 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."