Boros Mastiff 
Creature — Dog
$0.11 #21501 0.33 13.3 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%
$0.29↑#11052↑0.277.9 years↓
"Whenever this creature and at least two other creatures attack, create a 1/1 white Soldier creature token with lifelink."
Warmind Infantry84%
$0.08↓#29701↓0.2413.6 years
"Whenever this creature and at least two other creatures attack, this creature gets +2/+0 until end of turn."
Boros Elite84%
$0.12↑#192240.23↓13.6 years
"Whenever this creature and at least two other creatures attack, this creature gets +2/+2 until end of turn."
Tajic, Blade of the Legion83%
$0.37↑#9640↑0.20↓13.3 years
"Whenever this card and at least two other creatures attack, this card gets +5/+5 until end of turn."
Blood Burglar81%
$0.24↑#196260.05↓7.2 years↓
"During your turn, this creature has lifelink."
Leech Fanatic81%
$0.06↓#26708↓0.06↓5.4 years↓
"During your turn, this creature has lifelink."
Wojek Halberdiers80%
$0.07↓#248500.00↓13.6 years
"Whenever this creature and at least two other creatures attack, this creature gains first strike until end of turn."
Daring Skyjek80%
$0.05↓#26265↓0.50↑13.6 years
"Whenever this creature and at least two other creatures attack, this creature gains flying until end of turn."
Stone Haven Pilgrim78%
$0.18↑#29083↓0.21↓6.1 years↓
"Whenever this creature attacks, if you control an artifact or enchantment, this creature gets +1/+1 and gains lifelink until end of turn."
Shopkeeper's Bane78%
$0.23↑#12281↑0.00↓0.4 years↓
"Whenever this creature attacks, you gain 2 life."
Ordruun Veteran78%
$0.06↓#27318↓0.00↓13.6 years
"Whenever this creature and at least two other creatures attack, this creature gains double strike until end of turn."
Moonrise Cleric76%
$0.20↑#11462↑0.00↓2.1 years↓
"Whenever this creature attacks, you gain 1 life."
Herald of Faith76%
$0.18↑#176340.10↓8.1 years↓
"Whenever this creature attacks, you gain 2 life."
Prakhata Pillar-Bug76%
$0.08↓#26816↓0.00↓9.9 years↓
"
: This creature gains lifelink until end of turn."
: This creature gains lifelink until end of turn."
Glory-Bound Initiate76%
$0.13↑#239090.00↓9.4 years↓
"You may exert this creature as it attacks. When you do, it gets +1/+3 and gains lifelink until end of turn."
Nav Squad Commandos76%
$0.03↓#29787↓0.00↓13.6 years
"Whenever this creature and at least two other creatures attack, this creature gets +1/+1 until end of turn. Untap it."
Makeshift Battalion75%
$0.05↓#224690.00↓7.3 years↓
"Whenever this creature and at least two other creatures attack, put a +1/+1 counter on this creature."
Ritual Guardian74%
$0.07↓#27335↓0.274.9 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."
Sigiled Contender73%
$0.12↑#30430↓0.00↓6.2 years↓
"This creature has lifelink as long as it has a +1/+1 counter on it."
Seeker of the Way72%
$0.07↓#196370.04↓11.9 years↓
"Whenever you cast a noncreature spell, this creature gains lifelink until end of turn."