Boros Mastiff 
Creature — Dog
$0.14 #21818 0.00 13.5 years
Battalion — Whenever this creature and at least two other creatures attack, this creature gains lifelink until end of turn. (Damage dealt by a creature with lifelink also causes its controller to gain that much life.)
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Cards similar to Boros Mastiff 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.
Haazda Marshal88%
$0.27↑#11284↑0.078.0 years↓
"Whenever this creature and at least two other creatures attack, create a 1/1 white Soldier creature token with lifelink."
Warmind Infantry84%
$0.01↓#30027↓0.0013.7 years
"Whenever this creature and at least two other creatures attack, this creature gets +2/+0 until end of turn."
Boros Elite84%
$0.09↓#195080.21↑13.7 years
"Whenever this creature and at least two other creatures attack, this creature gets +2/+2 until end of turn."
Tajic, Blade of the Legion82%
$0.33↑#9932↑0.0013.5 years
"Whenever this card and at least two other creatures attack, this card gets +5/+5 until end of turn."
Daring Skyjek80%
$0.05↓#26571↓0.0013.7 years
"Whenever this creature and at least two other creatures attack, this creature gains flying until end of turn."
Wojek Halberdiers80%
$0.13↓#252390.0513.7 years
"Whenever this creature and at least two other creatures attack, this creature gains first strike until end of turn."
Blood Burglar80%
$0.23↑#197950.007.3 years↓
"During your turn, this creature has lifelink."
Leech Fanatic80%
$0.07↓#27168↓0.005.5 years↓
"During your turn, this creature has lifelink."
Battlegrace Angel79%
$1.30↑#12667↑0.0018.0 years↑
"Whenever a creature you control attacks alone, it gains lifelink until end of turn."
Ordruun Veteran78%
$0.08↓#27559↓0.0013.7 years
"Whenever this creature and at least two other creatures attack, this creature gains double strike until end of turn."
Shopkeeper's Bane78%
$0.14#11724↑0.020.5 years↓
"Whenever this creature attacks, you gain 2 life."
Stone Haven Pilgrim78%
$0.17↑#29322↓0.006.3 years↓
"Whenever this creature attacks, if you control an artifact or enchantment, this creature gets +1/+1 and gains lifelink until end of turn."
Moonrise Cleric76%
$0.22↑#11878↑0.002.2 years↓
"Whenever this creature attacks, you gain 1 life."
Herald of Faith76%
$0.16↑#177000.008.3 years↓
"Whenever this creature attacks, you gain 2 life."
Makeshift Battalion76%
$0.05↓#227240.007.5 years↓
"Whenever this creature and at least two other creatures attack, put a +1/+1 counter on this creature."
Nav Squad Commandos76%
$0.03↓#30129↓0.0013.7 years
"Whenever this creature and at least two other creatures attack, this creature gets +1/+1 until end of turn. Untap it."
Prakhata Pillar-Bug76%
$0.08↓#27223↓0.0010.1 years↓
"
: This creature gains lifelink until end of turn."
: This creature gains lifelink until end of turn."
Glory-Bound Initiate76%
$0.12↓#242560.009.5 years↓
"You may exert this creature as it attacks. When you do, it gets +1/+3 and gains lifelink until end of turn."
Victory's Herald73%
$0.24↑#11662↑0.18↑15.7 years↑
"Whenever this creature attacks, attacking creatures gain flying and lifelink until end of turn."
Ritual Guardian72%
$0.08↓#27603↓0.075.1 years↓
"At the beginning of combat on your turn, if you control three or more creatures with different powers, this creature gains lifelink until end of turn."