Excalibur II 
Legendary Artifact — Equipment
$0.70 #4735 0.22 1.2 years
Whenever you gain life, put a charge counter on Excalibur II.
Equipped creature gets +1/+1 for each charge counter on Excalibur II.
Equip 
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Cards similar to Excalibur II 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.
Tigra, Feline Fury93%
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"Whenever you gain life, put a +1/+1 counter on this card."
MJ, Rising Star93%
$0.23↓#15820↓0.08↓0.9 years
"Whenever you gain life, put a +1/+1 counter on this card."
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"Whenever you gain life, put a +1/+1 counter on this creature."
Blood Researcher93%
$0.18↓#16018↓0.06↓5.4 years↑
"Whenever you gain life, put a +1/+1 counter on this creature."
Scion of the Swarm93%
$0.11↓#17244↓0.255.9 years↑
"Whenever you gain life, put a +1/+1 counter on this creature."
Celestial Unicorn93%
$0.23↓#9235↓0.07↓5.1 years↑
"Whenever you gain life, put a +1/+1 counter on this creature."
Bloodthirsty Aerialist93%
$0.18↓#6691↓0.46↑7.2 years↑
"Whenever you gain life, put a +1/+1 counter on this creature."
Bloodbond Vampire93%
$0.25↓#13533↓0.3010.9 years↑
"Whenever you gain life, put a +1/+1 counter on this creature."
Serene Steward89%
$0.13↓#19425↓0.00↓10.9 years↑
"Whenever you gain life, you may pay 
. If you do, put a +1/+1 counter on target creature."
. If you do, put a +1/+1 counter on target creature."
Exemplar of Light88%
$0.75↑#1245↑0.311.8 years
"Whenever you gain life, put a +1/+1 counter on this creature."
Ajani's Pridemate88%
$0.17↓#2591↑0.2116.1 years↑
"Whenever you gain life, put a +1/+1 counter on this creature."
Cleric of Life's Bond87%
$0.25↓#13544↓0.295.9 years↑
"Whenever you gain life for the first time each turn, put a +1/+1 counter on this creature."
Qala, Ajani's Pridemate86%
$0.38↓#7586↓0.09↓1.8 years
"Whenever you gain life, put a +1/+1 counter on this card."
Vampire Scrivener86%
$0.18↓#13767↓0.47↑4.4 years↑
"Whenever you gain life during your turn, put a +1/+1 counter on this creature."
Aerith Gainsborough86%
$3.31↑#2214↑0.311.2 years
"Whenever you gain life, put a +1/+1 counter on this card."
Twinblade Paladin86%
$0.36↓#12041↓0.45↑7.2 years↑
"Whenever you gain life, put a +1/+1 counter on this creature."
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"Whenever you gain life, put a +1/+1 counter on this card."
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$4.91↑#1872↑0.252.8 years↑
"Whenever you gain life, put a +1/+1 counter on this creature."
Voice of the Blessed84%
$1.96↑#3108↑0.33↑4.8 years↑
"Whenever you gain life, put a +1/+1 counter on this creature."
Archangel of Thune82%
$17.32↑#1395↑0.59↑13.1 years↑
"Whenever you gain life, put a +1/+1 counter on each creature you control."