Merchant of Truth {2}{W}{W}
Creature — Angel Detective
Flying
Whenever a nontoken creature you control dies, investigate.
Clues you control have exalted. (Whenever a creature you control attacks alone, that creature gets +1/+1 until end of turn for each instance of exalted among permanents you control.)
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Cards that do something similar expected a card that isn't here?
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Homicide Investigator 93%
$0.20#14460
"Whenever one or more nontoken creatures you control die, investigate. This ability triggers only once each turn."
Remembrance 86%
$9.46#12714
"Whenever a nontoken creature you control dies, you may search your library for a card with the same name as that creature, reveal it, put it into your hand, then shuffle."
Nick Valentine, Private Eye 85%
$0.25#10744
"Whenever this card or another artifact creature you control dies, you may investigate."
The Cauldron of Eternity 80%
$1.37#9119
"Whenever a creature you control dies, put it on the bottom of its owner's library."
Massacre Girl, Known Killer 80%
$0.65#1652
"Whenever a creature an opponent controls dies, if its toughness was less than 1, draw a card."
Hawkeye, Avenging Archer 80%
$0.37#21716
"Whenever a creature an opponent controls dies, if this card dealt damage to it this turn, draw a card."