Tenacity 
Instant
$0.07 #19211 0.09 10.5 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%
$0.06↓#23844↓0.46↑9.1 years↓
"Creatures you control get +1/+1 until end of turn. Untap them."
War Flare92%
$0.04↓#198320.1011.7 years↑
"Creatures you control get +2/+1 until end of turn. Untap those creatures."
Rally to Battle92%
$0.07#24133↓0.167.7 years↓
"Creatures you control get +1/+3 until end of turn. Untap them."
Gleam of Resistance88%
$0.04↓#24909↓0.0517.7 years↑
"Creatures you control get +1/+2 until end of turn. Untap those creatures."
Rally of Wings86%
$0.23↑#7314↑0.35↑7.5 years↓
"Untap all creatures you control. Creatures you control with flying get +2/+2 until end of turn."
Call to Glory85%
$0.27↑#159900.0722.1 years↑
"Untap all creatures you control. Samurai creatures you control get +1/+1 until end of turn."
For the Emperor!81%
$0.61↑#10223↑0.31↑4.0 years↓
"Creatures you control get +2/+2 and gain vigilance and lifelink until end of turn."
Great Oak Guardian81%
$0.15↑#6747↑0.19↑10.9 years
"When this creature enters, creatures target player controls get +2/+2 until end of turn. Untap them."
Jeskai Charm80%
$0.27↑#9212↑0.0712.1 years↑
"• Creatures you control get +1/+1 and gain lifelink until end of turn."
Zealous Display80%
$0.11↑#172590.001.2 years↓
"Creatures you control get +2/+0 until end of turn. If it's not your turn, untap those creatures."
Mobilize80%
$1.29↑#10946↑0.44↑29.5 years↑
"Untap all creatures you control."
Roar of the Kha79%
$0.26↑#223600.27↑23.0 years↑
"• Creatures you control get +1/+1 until end of turn."
Rush of Battle78%
$0.05↓#226660.0012.1 years↑
"Creatures you control get +2/+1 until end of turn. Warrior creatures you control gain lifelink until end of turn."
Ready // Willing78%
$0.26↑#162230.0013.5 years↑
"Creatures you control gain indestructible until end of turn. Untap each creature you control."
Drumbellower77%
$2.55↑#1921↑0.68↑4.7 years↓
"Untap all creatures you control during each other player's untap step."
Mortal's Ardor76%
$0.16↑#205820.24↑12.7 years↑
"Target creature gets +1/+1 and gains lifelink until end of turn."
Grotesque Mutation76%
$0.17↑#191910.0010.5 years
"Target creature gets +3/+1 and gains lifelink until end of turn."
Glorious Charge76%
$0.03↓#25633↓0.0017.3 years↑
"Creatures you control get +1/+1 until end of turn."
Charge76%
$0.08↑#209560.058.5 years↓
"Creatures you control get +1/+1 until end of turn."
Warrior's Honor76%
$0.04↓#30201↓0.0029.7 years↑
"Creatures you control get +1/+1 until end of turn."