Primal Clay 
Artifact Creature — Shapeshifter
$0.16 #23490 0.57 32.5 years
As this creature enters, it becomes your choice of a 3/3 artifact creature, a 2/2 artifact creature with flying, or a 1/6 Wall artifact creature with defender in addition to its other types. (A creature with defender can't attack.)
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Cards similar to Primal Clay 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.
Primal Plasma98%
$0.07↓#277790.25↓19.6 years↓
"As this creature enters, it becomes your choice of a 3/3 creature, a 2/2 creature with flying, or a 1/6 creature with defender."
Corrupted Shapeshifter92%
$0.17↑#7924↑0.06↓2.2 years↓
"As this creature enters, it becomes your choice of a 3/3 creature with flying, a 2/5 creature with vigilance, or a 0/12 creature with defender."
Molten Sentry80%
$0.27↑#222130.20↓20.9 years↓
"As this creature enters, flip a coin. If the coin comes up heads, this creature enters as a 5/2 creature with haste. If it comes up tails, this creature enters as a 2/5 creature with defender."
Testament of Faith77%
$0.28↑#29289↓0.00↓24.9 years↓
"
: This enchantment becomes an X/X Wall creature with defender in addition to its other types until end of turn."
: This enchantment becomes an X/X Wall creature with defender in addition to its other types until end of turn."
Skinshifter74%
$0.33↑#202440.00↓15.1 years↓
"• Until end of turn, this creature becomes a Bird with base power and toughness 2/2 and gains flying."
Warden of the Wall70%
$0.17↑#250830.25↓14.6 years↓
"During turns other than yours, this artifact is a 2/3 Gargoyle artifact creature with flying."