Surge of Strength 

Instant
$0.26 #29695 0.14 30.4 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 Defender83%
$3.42↑#295980.0532.4 years↑
"Target creature gets +0/+X until end of turn, where X is its mana value."
Rush of Adrenaline82%
$0.14↓#13407↑0.00↓10.5 years↓
"Target creature gets +2/+1 and gains trample until end of turn."
Brute Strength82%
$0.06↓#9318↑0.0710.7 years↓
"Target creature gets +3/+1 and gains trample until end of turn."
Fanatical Fever82%
$0.23↓#320210.0631.4 years↑
"Target creature gets +3/+0 and gains trample until end of turn."
Blazing Shoal78%
$3.34↑#14369↑0.1621.7 years↓
"Target creature gets +X/+0 until end of turn."
+1 more matching line
Unnatural Predation76%
$0.09↓#242580.00↓15.7 years↓
"Target creature gets +1/+1 and gains trample until end of turn."
Tread Upon76%
$0.06↓#258910.00↓11.6 years↓
"Target creature gets +2/+2 and gains trample until end of turn."
Massive Might76%
$0.12↓#16139↑0.074.9 years↓
"Target creature gets +2/+2 and gains trample until end of turn."
World War Hulk76%
$0.99↑#7118↑1.51↑0.3 years↓
"Choose target creature you control. Until end of turn, double its power and toughness and it gains trample."
+1 more matching line
Goblin Anarchomancer76%
$0.34↑#558↑0.175.3 years↓
"Each spell you cast that's red or green costs
less to cast."
Enthusiastic Study76%
$0.24↓#20392↑0.075.5 years↓
"Target creature gets +3/+1 and gains trample until end of turn."
Invigorated Rampage75%
$0.15↓#10229↑0.139.7 years↓
"• Target creature gets +4/+0 and gains trample until end of turn."
Stolen Vitality75%
$0.07↓#15383↑0.38↑5.1 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."
Larger Than Life74%
$0.15↓#17797↑0.0610.1 years↓
"Target creature gets +4/+4 and gains trample until end of turn."
Confidence from Strength74%
$0.14↓#275170.058.3 years↓
"Target creature gets +4/+4 and gains trample until end of turn."
Wildsize74%
$0.11↓#17078↑0.00↓20.7 years↓
"Target creature gets +2/+2 and gains trample until end of turn."
Whirling Strike74%
$0.10↓#17687↑0.143.9 years↓
"Target creature gets +2/+0 and gains first strike and trample until end of turn."
Bestow Greatness74%
$0.17↓#14586↑0.00↓1.7 years↓
"Target creature gets +4/+4 and gains trample until end of turn."