Surge of Strength 

Instant
$0.24 #29325 0.06 30.2 years
As an additional cost to cast this spell, discard a red or green card.
Target creature gains trample and gets +X/+0 until end of turn, where X is that creature's mana value.
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Cards similar to Surge of Strength 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.
Great Defender84%
$3.40↑#297290.29↑32.3 years↑
"Target creature gets +0/+X until end of turn, where X is its mana value."
Rush of Adrenaline84%
$0.14↓#13201↑0.0710.4 years↓
"Target creature gets +2/+1 and gains trample until end of turn."
Brute Strength84%
$0.06↓#9211↑0.35↑10.6 years↓
"Target creature gets +3/+1 and gains trample until end of turn."
Fanatical Fever84%
$0.23↓#316800.0831.3 years↑
"Target creature gets +3/+0 and gains trample until end of turn."
Blazing Shoal82%
$3.50↑#14369↑0.33↑21.6 years↓
"Target creature gets +X/+0 until end of turn."
+1 more matching line
Unnatural Predation78%
$0.07↓#239490.33↑15.6 years↓
"Target creature gets +1/+1 and gains trample until end of turn."
Massive Might78%
$0.12↓#15842↑0.33↑4.8 years↓
"Target creature gets +2/+2 and gains trample until end of turn."
Tread Upon78%
$0.06↓#256030.0711.4 years↓
"Target creature gets +2/+2 and gains trample until end of turn."
World War Hulk78%
$1.05↑#8270↑0.000.2 years↓
"Choose target creature you control. Until end of turn, double its power and toughness and it gains trample."
+1 more matching line
Goblin Anarchomancer77%
$0.43↑#550↑0.19↑5.2 years↓
"Each spell you cast that's red or green costs
less to cast."
Enthusiastic Study76%
$0.23↓#20125↑0.50↑5.4 years↓
"Target creature gets +3/+1 and gains trample until end of turn."
Invigorated Rampage76%
$0.18↓#10055↑0.29↑9.6 years↓
"• Target creature gets +4/+0 and gains trample until end of turn."
Stolen Vitality76%
$0.08↓#15117↑0.004.9 years↓
"Target creature gets +3/+1 until end of turn. If it's your turn, that creature gains trample until end of turn. Otherwise, it gains first strike until end of turn."
Wildsize76%
$0.11↓#16753↑0.62↑20.6 years↓
"Target creature gets +2/+2 and gains trample until end of turn."
Whirling Strike76%
$0.10↓#17283↑0.003.8 years↓
"Target creature gets +2/+0 and gains first strike and trample until end of turn."
Bestow Greatness75%
$0.16↓#14562↑0.111.6 years↓
"Target creature gets +4/+4 and gains trample until end of turn."
Confidence from Strength75%
$0.15↓#271680.138.2 years↓
"Target creature gets +4/+4 and gains trample until end of turn."
Larger Than Life75%
$0.15↓#17502↑0.24↑9.9 years↓
"Target creature gets +4/+4 and gains trample until end of turn."