Lazav, Wearer of Faces 

Legendary Creature — Shapeshifter Detective
$0.23 #13843 0.00 2.6 years
Whenever Lazav attacks, exile target card from a graveyard, then investigate. (Create a Clue token. It's an artifact with "
, Sacrifice this token: Draw a card.")
Whenever you sacrifice a Clue, you may have Lazav become a copy of a creature card exiled with it until end of turn.
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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.
Daring Sleuth // Bearer of Overwhelming Truths79%
$0.06↓#19053↓0.40↑10.4 years↑
"When you sacrifice a Clue, transform this creature."
Raven Eagle78%
$0.32↑#10545↑0.000.8 years↓
"Whenever this creature enters or attacks, exile up to one target card from a graveyard. If a creature card is exiled this way, create a Clue token."
Thorough Investigation78%
$2.45↑#7064↑0.16↑5.1 years↑
"Whenever you sacrifice a Clue, venture into the dungeon."
+1 more matching line
Ulvenwald Mysteries78%
$0.11↓#7676↑0.0010.4 years↑
"Whenever you sacrifice a Clue, create a 1/1 white Human Soldier creature token."
Mimeoplasm, Revered One77%
$0.36↑#142990.25↑1.6 years↓
"
: this card becomes a copy of target creature card exiled with it, except it's 0/0 and has this ability."
Graven Abomination76%
$0.05↓#24618↓0.069.1 years↑
"Whenever this creature attacks, exile target card from defending player's graveyard."
Briarbridge Patrol76%
$0.18↓#17297↓0.20↑10.4 years↑
"At the beginning of each end step, if you sacrificed three or more Clues this turn, you may put a creature card from your hand onto the battlefield."
Disruptor Wanderglyph75%
$0.12↓#22826↓0.052.8 years
"Whenever this creature attacks, exile target card from an opponent's graveyard."
Dimir Doppelganger74%
$0.47↑#129000.21↑20.9 years↑
"

: Exile target creature card from a graveyard. This creature becomes a copy of that card, except it has this ability."
Dino DNA74%
$17.57↑#6192↑0.20↑2.8 years
"
,
: Exile target creature card from a graveyard. Activate only as a sorcery."
Hazel's Brewmaster73%
$3.96↑#2319↑0.38↑2.1 years
"Whenever this creature enters or attacks, exile up to one target card from a graveyard and create a Food token."
Havengul Laboratory // Havengul Mystery72%
$0.82↑#9001↑0.094.9 years↑
"At the beginning of your end step, if you sacrificed three or more Clues this turn, transform Havengul Laboratory."
Tireless Tracker72%
$0.24↑#654↑0.27↑10.4 years↑
"Whenever you sacrifice a Clue, put a +1/+1 counter on this creature."
Cryptoplasm72%
$0.63↑#126790.0715.6 years↑
"At the beginning of your upkeep, you may have this creature become a copy of another target creature, except it has this ability."
The Animus72%
$0.30↑#8918↑0.22↑2.2 years
"At the beginning of your end step, exile up to one target legendary creature card from a graveyard with a memory counter on it."
+1 more matching line
Lonis, Genetics Expert70%
$5.49↑#11041↑0.50↑2.5 years
"Whenever you sacrifice a Clue, put a +1/+1 counter on another target creature you control."
Abyssal Harvester70%
$0.36↑#3081↑0.23↑1.8 years
"
: Exile target creature card from a graveyard that was put there this turn. Create a token that's a copy of it, except it's a Nightmare in addition to its other types. Then exile all other Nightmare tokens you control."
Lazav, Familiar Stranger70%
$0.21↓#129610.28↑2.4 years
"Whenever you commit a crime, put a +1/+1 counter on this card. Then you may exile a card from a graveyard. If a creature card was exiled this way, you may have this card become a copy of that card until end of turn. This ability triggers only once each turn."