And They Shall Know No Fear 

Instant
Choose a creature type. Creatures you control of the chosen type get +1/+0 and gain indestructible until end of turn.
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Cards that do something similar 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.
Luminescent Rain 89%
$0.13#18308
"Choose a creature type. You gain 2 life for each permanent you control of that type."
Roar of the Crowd 88%
$0.17#19641
"Choose a creature type. this card deals damage to any target equal to the number of permanents you control of the chosen type."
Harmonized Crescendo 88%
$1.03#3553
"Choose a creature type. Draw a card for each permanent you control of that type."
Distant Melody 88%
$0.40#636
"Choose a creature type. Draw a card for each permanent you control of that type."
Peer Pressure 87%
$1.61#12010
"Choose a creature type. If you control more creatures of that type than each other player, you gain control of all creatures of that type."
Kindred Charge 87%
$9.20#5781
"Choose a creature type. For each creature you control of the chosen type, create a token that's a copy of that creature. Those tokens gain haste. Exile them at the beginning of the next end step."
For the Ancestors 86%
$3.50#7782
"Choose a creature type. Look at the top six cards of your library. You may reveal any number of cards of the chosen type from among them and put the revealed cards into your hand. Put the rest on the bottom of your library in a random order."
Kindred Summons 85%
$0.52#2399
"Choose a creature type. Reveal cards from the top of your library until you reveal X creature cards of the chosen type, where X is the number of creatures you control of that type. Put those cards onto the battlefield, then shuffle the rest of the revealed cards into your library."