Tenacity 
Instant
$0.07 #19097 0.15 10.4 years
Creatures you control get +1/+1 and gain lifelink until end of turn. Untap those creatures. (Damage dealt by those creatures also causes you to gain that much life.)
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Cards similar to Tenacity expected a card that isn't here?
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Rallying Roar92%
$0.05↓#23501↓0.40↑8.9 years↓
"Creatures you control get +1/+1 until end of turn. Untap them."
War Flare92%
$0.05↓#195910.00↓11.6 years↑
"Creatures you control get +2/+1 until end of turn. Untap those creatures."
Rally to Battle92%
$0.08↑#23734↓0.057.6 years↓
"Creatures you control get +1/+3 until end of turn. Untap them."
Gleam of Resistance86%
$0.04↓#24572↓0.0517.6 years↑
"Creatures you control get +1/+2 until end of turn. Untap those creatures."
Rally of Wings85%
$0.23↑#7210↑0.00↓7.3 years↓
"Untap all creatures you control. Creatures you control with flying get +2/+2 until end of turn."
Call to Glory84%
$0.25↑#156930.00↓21.9 years↑
"Untap all creatures you control. Samurai creatures you control get +1/+1 until end of turn."
For the Emperor!82%
$0.72↑#10031↑0.233.9 years↓
"Creatures you control get +2/+2 and gain vigilance and lifelink until end of turn."
Mobilize81%
$1.71↑#10886↑0.40↑29.3 years↑
"Untap all creatures you control."
Great Oak Guardian81%
$0.15↑#6781↑0.50↑10.8 years
"When this creature enters, creatures target player controls get +2/+2 until end of turn. Untap them."
Roar of the Kha80%
$0.21↑#219700.2422.9 years↑
"• Creatures you control get +1/+1 until end of turn."
Zealous Display79%
$0.06↓#172520.091.1 years↓
"Creatures you control get +2/+0 until end of turn. If it's not your turn, untap those creatures."
Rush of Battle79%
$0.06↓#224200.25↑11.9 years↑
"Creatures you control get +2/+1 until end of turn. Warrior creatures you control gain lifelink until end of turn."
Jeskai Charm78%
$0.24↑#9050↑0.2011.9 years↑
"• Creatures you control get +1/+1 and gain lifelink until end of turn."
To Arms!78%
$0.20↑#6760↑0.1220.6 years↑
"Untap all creatures you control."
Drumbellower78%
$2.65↑#1921↑0.69↑4.5 years↓
"Untap all creatures you control during each other player's untap step."
Ready // Willing76%
$0.26↑#158920.00↓13.3 years↑
"Creatures you control gain indestructible until end of turn. Untap each creature you control."
Veteran Beastrider76%
$0.28↑#9654↑0.211.6 years↓
"
: Creatures you control get +1/+1 until end of turn."
: Creatures you control get +1/+1 until end of turn."
Gideon, Martial Paragon74%
$0.93↑#165620.37↑9.4 years↓
"+2: Untap all creatures you control. Those creatures get +1/+1 until end of turn."
Murkfiend Liege74%
$2.14↑#2640↑0.36↑18.1 years↑
"Other blue creatures you control get +1/+1."
Prepare // Fight74%
$0.14↑#219290.70↑9.4 years↓
"Untap target creature. It gets +2/+2 and gains lifelink until end of turn."