Jamie McCrimmon 
Legendary Creature — Human Warrior
$0.24 #15577 0.13 2.9 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%
$0.18↓#23705↓0.00↓8.4 years↑
"Whenever you cast a historic spell, this creature gets +1/+1 until end of turn."
Tegan Jovanka92%
$0.23↓#12158↑0.072.9 years
"Doctor's companion"
Peri Brown88%
$0.27↑#134640.33↑2.9 years
"Doctor's companion"
Manaplasm84%
$0.18↓#163290.40↑17.9 years↑
"Whenever you cast a spell, this creature gets +X/+X until end of turn, where X is that spell's mana value."
Thorin Oakenshield82%
$0.24#10874↑0.00↓0.1 years↓
"Trample"
Jo Grant81%
$0.23↓#159830.212.9 years
"Doctor's companion"
Daring Archaeologist80%
$0.22↓#19603↓0.36↑8.4 years↑
"Whenever you cast a historic spell, put a +1/+1 counter on this creature."
Sarah Jane Smith80%
$0.32↑#9294↑0.29↑2.9 years
"Whenever you cast a historic spell, investigate. This ability triggers only once each turn."
+1 more matching line
Barbara Wright79%
$0.58↑#7158↑0.43↑2.9 years
"Doctor's companion"
Teshar, Ancestor's Apostle78%
$0.18↓#1912↑0.37↑8.4 years↑
"Whenever you cast a historic spell, return target creature card with mana value 3 or less from your graveyard to the battlefield."
Dan Lewis78%
$0.18↓#183910.29↑2.9 years
"Doctor's companion"
Ian Chesterton78%
$0.34↑#130270.94↑2.9 years
"Doctor's companion"
Jhoira, Weatherlight Captain78%
$0.43↑#1070↑0.72↑8.4 years↑
"Whenever you cast a historic spell, draw a card."
Excalibur, Sword of Eden77%
$17.52↑#912↑0.59↑2.2 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%
$0.28↑#140850.39↑2.9 years
"Doctor's companion"
+1 more matching line
Traxos, Scourge of Kroog76%
$0.36↑#3947↑0.39↑8.4 years↑
"Whenever you cast a historic spell, untap this card."
+1 more matching line
Livaan, Cultist of Tiamat76%
$0.22↓#9264↑0.36↑4.2 years↑
"Whenever you cast a noncreature spell, target creature gets +X/+0 until end of turn, where X is that spell's mana value."
Yasmin Khan74%
$0.24#155210.76↑2.9 years
"Doctor's companion"
Cabal Paladin74%
$0.18↓#164500.93↑8.4 years↑
"Whenever you cast a historic spell, this creature deals 2 damage to each opponent."
Susan Foreman74%
$0.24#18938↓0.47↑2.9 years
"Doctor's companion"