Shape Stealer 
Creature — Shapeshifter Spirit
$0.35 #25663 0.31 21.3 years
Whenever this creature blocks or becomes blocked by a creature, change this creature's base power and toughness to that creature's power and toughness until end of turn.
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Cards similar to Shape Stealer 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.
Serene Master94%
$0.68↑#18990↑0.50↑12.8 years↓
"Whenever this creature blocks, exchange its power and the power of target creature it's blocking until end of combat."
Sentinel88%
$0.41↑#246310.17↓32.3 years↑
"
: Change this creature's base toughness to 1 plus the power of target creature blocking or blocked by this creature."
: Change this creature's base toughness to 1 plus the power of target creature blocking or blocked by this creature."
Riptide Mangler86%
$0.39↑#284810.2923.6 years↑
"
: Change this creature's base power to target creature's power."
: Change this creature's base power to target creature's power."
Sworn Defender82%
$0.91↑#288150.50↑30.2 years↑
": This creature's power becomes the toughness of target creature blocking or being blocked by this creature minus 1 until end of turn, and its toughness becomes 1 plus the power of that creature until end of turn."
: This creature's power becomes the toughness of target creature blocking or being blocked by this creature minus 1 until end of turn, and its toughness becomes 1 plus the power of that creature until end of turn."
Meglonoth78%
$0.36↑#220300.3817.6 years↓
"Whenever this creature blocks a creature, this creature deals damage to that creature's controller equal to this creature's power."
Engulfing Slagwurm78%
$0.54↑#10179↑0.00↓15.9 years↓
"Whenever this creature blocks or becomes blocked by a creature, destroy that creature. You gain life equal to that creature's toughness."
Freelance Muscle74%
$0.17↓#17496↑0.224.4 years↓
"Whenever this creature attacks or blocks, it gets +X/+X until end of turn, where X is the greatest power and/or toughness among other creatures you control."
Halfdane72%
$35.20↑#283000.60↑32.3 years↑
"At the beginning of your upkeep, change this card's base power and toughness to the power and toughness of target creature other than this card until the end of your next upkeep."
Viashino Weaponsmith70%
$0.15↓#31314↓0.00↓27.9 years↑
"Whenever this creature becomes blocked by a creature, this creature gets +2/+2 until end of turn."
Raging Gorilla70%
$0.16↓#20060↑0.00↓29.6 years↑
"Whenever this creature blocks or becomes blocked, it gets +2/-2 until end of turn."
Kresh the Bloodbraided70%
$1.42↑#9098↑0.3017.9 years↓
"Whenever another creature dies, you may put X +1/+1 counters on Kresh, where X is that creature's power."
Unruly Krasis70%
$0.41↑#219640.06↓2.5 years↓
"Whenever this creature attacks, you may have the base power and toughness of another target creature you control become X/X until end of turn, where X is this creature's power."
Kalitas, Bloodchief of Ghet70%
$6.16↑#16418↑0.04↓16.9 years↓
"
, 
: Destroy target creature. If that creature dies this way, create a black Vampire creature token. Its power is equal to that creature's power and its toughness is equal to that creature's toughness."
, : Destroy target creature. If that creature dies this way, create a black Vampire creature token. Its power is equal to that creature's power and its toughness is equal to that creature's toughness."
Royal Trooper70%
$0.06↓#307380.19↓27.2 years↑
"Whenever this creature blocks, it gets +2/+2 until end of turn."
Giant Badger70%
$0.09↓#300620.07↓31.5 years↑
"Whenever this creature blocks, it gets +2/+2 until end of turn."
Town Sentry70%
$0.30↓#31918↓0.00↓28.2 years↑
"Whenever this creature blocks, it gets +0/+2 until end of turn."
Shu Defender70%
$1.21↑#31205↓0.00↓27.3 years↑
"Whenever this creature blocks, it gets +0/+2 until end of turn."
Folk of An-Havva70%
$0.11↓#31235↓0.3630.9 years↑
"Whenever this creature blocks, it gets +2/+0 until end of turn."