Jamie McCrimmon 
Legendary Creature — Human Warrior
$0.22 #15925 0.39 3.0 years
Trample
Whenever you cast a historic spell, Jamie McCrimmon gets +X/+X until end of turn, where X is that spell's mana value. (Artifacts, legendaries, and Sagas are historic.)
Doctor's companion (You can have two commanders if the other is the Doctor.)
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Cards similar to Jamie McCrimmon 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.
Serra Disciple92%
$0.22#24045↓0.00↓8.5 years↑
"Whenever you cast a historic spell, this creature gets +1/+1 until end of turn."
Tegan Jovanka88%
$0.29↑#12482↑0.29↓3.0 years
"Doctor's companion"
Peri Brown88%
$0.25↑#137930.00↓3.0 years
"Doctor's companion"
Manaplasm84%
$0.20↓#164630.00↓18.0 years↑
"Whenever you cast a spell, this creature gets +X/+X until end of turn, where X is that spell's mana value."
Jo Grant81%
$0.14↓#163740.14↓3.0 years
"Doctor's companion"
Thorin Oakenshield80%
$0.23↑#8505↑0.18↓0.2 years↓
"Trample"
Daring Archaeologist80%
$0.21↓#19902↓0.00↓8.5 years↑
"Whenever you cast a historic spell, put a +1/+1 counter on this creature."
Sarah Jane Smith80%
$0.33↑#9564↑0.323.0 years
"Whenever you cast a historic spell, investigate. This ability triggers only once each turn."
+1 more matching line
Barbara Wright79%
$0.58↑#7261↑0.353.0 years
"Doctor's companion"
Teshar, Ancestor's Apostle78%
$0.19↓#1954↑0.28↓8.5 years↑
"Whenever you cast a historic spell, return target creature card with mana value 3 or less from your graveyard to the battlefield."
Ian Chesterton78%
$0.33↑#133650.413.0 years
"Doctor's companion"
Dan Lewis78%
$0.19↓#186610.13↓3.0 years
"Doctor's companion"
Jhoira, Weatherlight Captain78%
$0.41↑#1068↑0.50↑8.5 years↑
"Whenever you cast a historic spell, draw a card."
Excalibur, Sword of Eden77%
$18.68↑#928↑0.58↑2.3 years
"This spell costs 
less to cast, where X is the total mana value of historic permanents you control."
less to cast, where X is the total mana value of historic permanents you control."
Graham O'Brien77%
$0.33↑#142310.333.0 years
"Doctor's companion"
+1 more matching line
Inferno Project76%
$0.23↑#22268↓0.315.5 years↑
"Trample"
Traxos, Scourge of Kroog76%
$0.39↑#3946↑0.05↓8.5 years↑
"Whenever you cast a historic spell, untap this card."
Yasmin Khan74%
$0.25↑#159370.00↓3.0 years
"Doctor's companion"
Cabal Paladin74%
$0.16↓#165830.18↓8.5 years↑
"Whenever you cast a historic spell, this creature deals 2 damage to each opponent."
Leela, Sevateem Warrior74%
$0.24↑#182060.57↑3.0 years
"Doctor's companion"