Rallying Roar 

Instant
Creatures you control get +1/+1 until end of turn. Untap them.
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Cards that do something similar expected a card that isn't here?
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Gleam of Resistance 99%
$0.04#24276
"Creatures you control get +1/+2 until end of turn. Untap those creatures."
Surge of Thoughtweft 91%
$0.19#21272
"Creatures you control get +1/+1 until end of turn. If you control a Kithkin, draw a card."
Strength of Night 90%
$0.05#30054
"Creatures you control get +1/+1 until end of turn. If this spell was kicked, Zombie creatures you control get an additional +2/+2 until end of turn."
Pride of Conquerors 90%
$0.17#23915
"Creatures you control get +1/+1 until end of turn. If you have the city's blessing, those creatures get +2/+2 until end of turn instead."
Bold Defense 90%
$0.05#30132
"Creatures you control get +1/+1 until end of turn. If this spell was kicked, instead creatures you control get +2/+2 and gain first strike until end of turn."
Dauntless Unity 90%
$0.06#25006
"Creatures you control get +1/+1 until end of turn. If this spell was kicked, those creatures get +2/+1 until end of turn instead."