Rush of Blood 

Instant
$0.33 #13781 0.05 14.5 years
Target creature gets +X/+0 until end of turn, where X is its power.
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Cards similar to Rush of Blood expected a card that isn't here?
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Unleash Fury96%
$0.39↑#1643↑0.21↑6.3 years↓
"Double the power of target creature until end of turn."
Onward // Victory95%
$0.21↓#21454↓0.119.5 years↓
"Target creature gets +X/+0 until end of turn, where X is its power."
Exponential Growth92%
$0.52↑#6787↑0.33↑5.5 years↓
"Until end of turn, double target creature's power X times."
Soul's Might91%
$0.13↓#144590.24↑18.0 years↑
"Put X +1/+1 counters on target creature, where X is that creature's power."
Nantuko Mentor90%
$0.34↑#23913↓0.0725.1 years↑
"
,
: Target creature gets +X/+X until end of turn, where X is that creature's power."
Auriok Bladewarden88%
$0.08↓#25403↓0.0023.0 years↑
"
: Target creature gets +X/+X until end of turn, where X is this creature's power."
Brambleguard Captain88%
$0.20↓#119240.052.2 years↓
"At the beginning of combat on your turn, target creature you control gets +X/+0 until end of turn, where X is this creature's power."
Legion Leadership // Legion Stronghold86%
$0.45↑#1224↑0.092.3 years↓
"Until end of turn, double target creature's power and it gains first strike."
Epic Fight84%
$0.38↑#9929↑0.29↑0.3 years↓
"• Double target creature's power and toughness until end of turn."
Fatal Frenzy84%
$0.58↑#145180.22↑19.7 years↑
"Until end of turn, target creature you control gains trample and gets +X/+0, where X is its power. Sacrifice it at the beginning of the next end step."
Thickest in the Thicket82%
$0.26↓#3036↑0.16↑2.2 years↓
"When this enchantment enters, put X +1/+1 counters on target creature, where X is that creature's power."
Double Trouble82%
$2.01↑#134230.24↑1.1 years↓
"Double the power of each creature you control until end of turn."
Choose Your Weapon80%
$0.25↓#10520↑0.065.2 years↓
"• Two-Weapon Fighting — Double target creature's power and toughness until end of turn."
Dragonclaw Strike80%
$0.24↓#119640.151.5 years↓
"Double the power and toughness of target creature you control until end of turn. Then it fights up to one target creature an opponent controls."
Roar of Endless Song80%
$0.20↓#133140.101.5 years↓
"Double the power and toughness of each creature you control until end of turn."
Mr. Orfeo, the Boulder80%
$0.23↓#7948↑0.064.5 years↓
"Whenever you attack, double target creature's power until end of turn."
Overwhelming Stampede79%
$0.67↑#524↑0.55↑16.3 years↑
"Until end of turn, creatures you control gain trample and get +X/+X, where X is the greatest power among creatures you control."
Berserk78%
$6.47↑#3440↑0.18↑33.2 years↑
"Target creature gains trample and gets +X/+0 until end of turn, where X is its power. At the beginning of the next end step, destroy that creature if it attacked this turn."