Shapeshifter 
Artifact Creature — Shapeshifter
$0.21 #28961 0.18 32.5 years
As this creature enters, choose a number between 0 and 7.
At the beginning of your upkeep, you may choose a number between 0 and 7.
Shapeshifter's power is equal to the last chosen number and its toughness is equal to 7 minus that number.
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Cards similar to Shapeshifter 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.
Snowmelt Stag78%
$0.11↓#241970.081.4 years↓
"During your turn, this creature has base power and toughness 5/2."
Halfdane77%
$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."
Amplifire74%
$0.19↓#247710.197.6 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."
Quandrix Charm72%
$0.17↓#7995↑0.00↓0.4 years↓
"Choose one —"
+1 more matching line
Unruly Krasis70%
$0.41↑#21964↑0.06↓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."
Skinshifter70%
$0.33↑#20244↑0.00↓15.1 years↓
"
: Choose one. Activate only once each turn."
: Choose one. Activate only once each turn."