Coat of Arms 
Artifact
$10.41 #942 0.87 28.2 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%
$12.17↑#11037↓0.11↓21.9 years↓
"Creatures that share a creature type with equipped creature get +1/+1."
Shared Animosity82%
$3.79↓#679↑0.41↓18.6 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%
$5.12↓#8700↓0.25↓23.3 years↓
"Enchanted creature gets +2/+2 for each other creature on the battlefield that shares a creature type with it."
Banner of Kinship80%
$8.67↓#626↑0.37↓1.8 years↓
"Creatures you control of the chosen type get +1/+1 for each fellowship counter on this artifact."
Stoneforge Masterwork77%
$3.50↓#5080↓0.36↓10.6 years↓
"Equipped creature gets +1/+1 for each other creature you control that shares a creature type with it."
Shared Triumph76%
$4.03↓#16548↓0.00↓23.9 years↓
"Creatures of the chosen type get +1/+1."
Crown of Vigor76%
$0.10↓#26726↓0.20↓23.9 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↓#1759↓0.15↓15.1 years↓
"Other creatures you control of the chosen type get +1/+1."
Brass Herald72%
$0.15↓#14391↓0.04↓25.3 years↓
"Creatures of the chosen type get +1/+1."
Rally the Ranks72%
$0.36↓#4621↓0.14↓5.6 years↓
"Creatures you control of the chosen type get +1/+1."
Paliano Vanguard72%
$0.12↓#31966↓0.06↓10.0 years↓
"Other creatures you control of a type you noted for cards named this card get +1/+1."
Instruments of War71%
$0.38↓#13991↓0.27↓3.8 years↓
"Creatures you control of the chosen type get +1/+1."
Tribal Unity70%
$0.43↓#17258↓0.00↓23.9 years↓
"Creatures of the creature type of your choice get +X/+X until end of turn."
Benalish Marshal70%
$0.48↓#7850↓0.44↓8.4 years↓
"Other creatures you control get +1/+1."
Kongming, "Sleeping Dragon"70%
$0.18↓#17673↓0.42↓27.3 years
"Other creatures you control get +1/+1."
Mana Echoes70%
$54.75↑#4017↓0.73↓23.9 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%
$0.21↓#29673↓0.37↓27.2 years
"All creatures get +1/+1 until end of turn."