Xavier Sal, Infested Captain 


Legendary Creature — Human Fungus Pirate
{T}, Remove a counter from another permanent you control: Populate. Activate only as a sorcery. (Create a token that's a copy of a creature token you control.)
{T}, Sacrifice another creature: Proliferate. Activate only as a sorcery. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)
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Cards that do something similar 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.
O'aka, Traveling Merchant 87%
$0.33#3611
"{T}, Remove a counter from a nonland permanent you control: Draw a card."
Scholar of New Horizons 85%
$1.35#2679
"{T}, Remove a counter from a permanent you control: Search your library for a Plains card and reveal it. If an opponent controls more lands than you, you may put that card onto the battlefield tapped. If you don't put the card onto the battlefield, put it into your hand. Then shuffle."
Diamond Valley 85%
#17172
"{T}, Sacrifice a creature: You gain life equal to the sacrificed creature's toughness."
Arguel's Blood Fast // Temple of Aclazotz 85%
$0.36#8311
"{T}, Sacrifice a creature: You gain life equal to the sacrificed creature's toughness."
Magus of the Jar 85%
$1.39#16033
"{T}, Sacrifice this creature: Each player exiles all cards from their hand face down and draws seven cards. At the beginning of the next end step, each player discards their hand and returns to their hand each card they exiled this way."
Liliana's Steward 83%
$0.18#18076
"{T}, Sacrifice this creature: Target opponent discards a card. Activate only as a sorcery."
Cliffside Rescuer 83%
$0.28#12690
"{T}, Sacrifice this creature: Target permanent you control gains protection from each of your opponents until end of turn."
Cephalid Pathmage 82%
$0.16#22951
"{T}, Sacrifice this creature: Target creature can't be blocked this turn."