Halfdane 
Legendary Creature — Shapeshifter
$35.97 #28608 0.06 32.4 years
At the beginning of your upkeep, Halfdane's base power and toughness become equal to the power and toughness of target creature other than Halfdane until the end of your next upkeep.
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Cards similar to Halfdane 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.
Amplifire86%
$0.17↓#249380.17↑7.7 years↓
"At the beginning of your upkeep, reveal cards from the top of your library until you reveal a creature card. Until your next turn, this creature's base power becomes twice that card's power and its base toughness becomes twice that card's toughness. Put the revealed cards on the bottom of your library in a random order."
Eldrazi Mimic83%
$1.02↓#10767↑0.0710.7 years↓
"Whenever another colorless creature you control enters, you may have this creature's base power and toughness become equal to that creature's power and toughness until end of turn."
Gigantomancer80%
$0.40↓#21075↑0.0616.5 years↓
": Target creature you control has base power and toughness 7/7 until end of turn."
: Target creature you control has base power and toughness 7/7 until end of turn."
Shapeshifter80%
$0.21↓#290710.1532.6 years
"this card's power is equal to the last chosen number and its toughness is equal to 7 minus that number."
Gnottvold Hermit // Chrome Host Hulk79%
$0.09↓#295010.003.5 years↓
"Whenever this creature attacks, up to one other target creature has base power and toughness 5/5 until end of turn."
Galion, Elvenking's Butler78%
$0.16↓#20514↑0.100.2 years↓
"Whenever this card attacks, choose up to one other target creature you control. Its base power and toughness become equal to this card's power and toughness until end of turn."
Riptide Mangler78%
$0.35↓#288050.24↑23.7 years↓
": This creature's base power becomes equal to target creature's power."
: This creature's base power becomes equal to target creature's power."
Duplicant77%
$0.19↓#2915↑0.29↑23.0 years↓
"As long as a card exiled with this creature is a creature card, this creature has the power, toughness, and creature types of the last creature card exiled with it. It's still a Shapeshifter."
Unruly Krasis76%
$0.38↓#22363↑0.112.7 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."
Creepy Puppeteer76%
$0.17↓#260080.004.9 years↓
"Whenever this creature attacks, if you attacked with exactly one other creature this combat, you may have that creature's base power and toughness become 4/3 until end of turn."
Square Up76%
$0.07↓#279280.005.5 years↓
"Target creature has base power and toughness 4/4 until end of turn."
Sentinel75%
$0.40↓#249120.36↑32.4 years
"
: This creature's base toughness becomes equal to 1 plus the power of target creature blocking or blocked by this creature."
: This creature's base toughness becomes equal to 1 plus the power of target creature blocking or blocked by this creature."
Tanazir Quandrix74%
$0.32↓#8363↑0.86↑5.5 years↓
"Whenever this card attacks, you may have the base power and toughness of other creatures you control become equal to this card's power and toughness until end of turn."
Shape Stealer73%
$0.34↓#259940.25↑21.4 years↓
"Whenever this creature blocks or becomes blocked by a creature, this creature's base power and toughness become equal to that creature's power and toughness until end of turn."
Snowmelt Stag72%
$0.12↓#243480.001.5 years↓
"During your turn, this creature has base power and toughness 5/2."
Zhalfirin Shapecraft72%
$0.15↓#14140↑0.003.5 years↓
"Target creature has base power and toughness 4/3 until end of turn."
Predator's Rapport72%
$0.17↓#14692↑0.0013.7 years↓
"Choose target creature you control. You gain life equal to that creature's power plus its toughness."
Jaws of Defeat71%
$0.92↓#4206↑0.32↑1.5 years↓
"Whenever a creature you control enters, target opponent loses life equal to the difference between that creature's power and its toughness."
Creeperhulk70%
$0.23↓#20994↑0.0612.0 years↓
"
: Until end of turn, target creature you control has base power and toughness 5/5 and gains trample."
: Until end of turn, target creature you control has base power and toughness 5/5 and gains trample."
Sworn Defender70%
$1.01↓#290950.0030.4 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."