Coat of Arms 
Artifact
$12.24 #960 0.82 28.3 years
Each creature gets +1/+1 for each other creature on the battlefield that shares at least one creature type with it. (For example, if two Goblin Warriors and a Goblin Shaman are on the battlefield, each gets +2/+2.)
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Cards similar to Coat of Arms 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.
Konda's Banner84%
$5.35↓#11053↓0.11↓22.1 years↓
"Creatures that share a creature type with equipped creature get +1/+1."
Shared Animosity82%
$4.15↓#686↑0.40↓18.7 years↓
"Whenever a creature you control attacks, it gets +1/+0 until end of turn for each other attacking creature that shares a creature type with it."
Alpha Status80%
$4.48↓#8794↓0.53↓23.4 years↓
"Enchanted creature gets +2/+2 for each other creature on the battlefield that shares a creature type with it."
Banner of Kinship80%
$6.83↓#614↑0.40↓1.9 years↓
"Creatures you control of the chosen type get +1/+1 for each fellowship counter on this artifact."
Stoneforge Masterwork77%
$4.31↓#4976↓0.65↓10.7 years↓
"Equipped creature gets +1/+1 for each other creature you control that shares a creature type with it."
Shared Triumph76%
$3.98↓#16789↓0.12↓24.0 years↓
"Creatures of the chosen type get +1/+1."
Crown of Vigor76%
$0.11↓#27025↓0.00↓24.0 years↓
"Sacrifice this Aura: Enchanted creature and other creatures that share a creature type with it get +1/+1 until end of turn."
Adaptive Automaton72%
$0.43↓#1782↓0.14↓15.3 years↓
"Other creatures you control of the chosen type get +1/+1."
Brass Herald72%
$0.23↓#14702↓0.00↓25.4 years↓
"Creatures of the chosen type get +1/+1."
Rally the Ranks72%
$0.35↓#4714↓0.11↓5.7 years↓
"Creatures you control of the chosen type get +1/+1."
Paliano Vanguard72%
$0.14↓#32255↓0.00↓10.1 years↓
"Other creatures you control of a type you noted for cards named this card get +1/+1."
Instruments of War71%
$0.37↓#14293↓0.31↓3.9 years↓
"Creatures you control of the chosen type get +1/+1."
Benalish Marshal70%
$0.45↓#7990↓0.00↓8.5 years↓
"Other creatures you control get +1/+1."
Kongming, "Sleeping Dragon"70%
$0.18↓#18103↓0.10↓27.5 years
"Other creatures you control get +1/+1."
Tribal Unity70%
$0.40↓#17573↓0.12↓24.0 years↓
"Creatures of the creature type of your choice get +X/+X until end of turn."
Mana Echoes70%
$55.91↑#4029↓0.70↓24.0 years↓
"Whenever a creature enters, you may add an amount of 
equal to the number of creatures you control that share a creature type with it."
equal to the number of creatures you control that share a creature type with it."
Magnify70%
$0.19↓#29976↓0.29↓27.4 years
"All creatures get +1/+1 until end of turn."