Seraphic Greatsword 

Artifact — Equipment
$0.76 #14264 0.47 5.8 years
Equipped creature gets +2/+2.
Whenever equipped creature attacks the player with the most life or tied for most life, create a 4/4 white Angel creature token with flying that's tapped and attacking that player.
Equip 
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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.
Preacher of the Schism82%
$1.14↑#4667↑0.25↓2.8 years↓
"Whenever this creature attacks the player with the most life or tied for most life, create a 1/1 white Vampire creature token with lifelink."
Veteran Soldier80%
$0.23↓#118020.11↓4.2 years↓
"Commander creatures you own have "Whenever this creature attacks a player, if no opponent has more life than that player, for each opponent, create a 1/1 white Soldier creature token that's tapped and attacking that opponent.""
Shard of Broken Glass79%
$0.10↓#21252↓0.07↓10.4 years↑
"Equipped creature gets +1/+0."
+1 more matching line
Stormbeacon Blade78%
$0.23↓#123890.11↓1.4 years↓
"Equipped creature gets +3/+0."
+2 more matching lines
Captain's Claws77%
$0.38↓#10297↑0.32↓10.6 years↑
"Whenever equipped creature attacks, create a 1/1 white Kor Ally creature token that's tapped and attacking."
+1 more matching line
Moonsilver Spear76%
$0.71↓#6693↑0.24↓14.4 years↑
"Whenever equipped creature attacks, create a 4/4 white Angel creature token with flying."
+1 more matching line
Sword Coast Sailor76%
$0.18↓#5880↑0.00↓4.2 years↓
"Commander creatures you own have "Whenever this creature attacks a player, if no opponent has more life than that player, this creature can't be blocked this turn.""
Undercover Butler73%
$0.22↓#29013↓0.24↓2.5 years↓
"Whenever this creature attacks the player with the most life or tied for most life, it can't be blocked this turn."
Throwing Knife72%
$0.15↓#27172↓0.5711.1 years↑
"Equipped creature gets +2/+0."
+1 more matching line
Priest of the Blessed Graf72%
$0.36↓#125330.00↓4.8 years
"At the beginning of your end step, create X 1/1 white Spirit creature tokens with flying, where X is the number of opponents who control more lands than you."
Guild Artisan72%
$0.26↓#3593↑0.12↓4.2 years↓
"Commander creatures you own have "Whenever this creature attacks a player, if no opponent has more life than that player, you create two Treasure tokens.""
Sigiled Sword of Valeron71%
$0.38↓#8566↑0.26↓8.1 years↑
"Whenever equipped creature attacks, create a 2/2 white Knight creature token with vigilance that's attacking."
+1 more matching line
Andúril, Flame of the West71%
$4.99↑#3445↑0.25↓3.2 years↓
"Whenever equipped creature attacks, create two tapped 1/1 white Spirit creature tokens with flying. If that creature is legendary, instead create two of those tokens that are tapped and attacking."
+2 more matching lines