Explosive Growth 
Instant
Kicker {5} (You may pay an additional {5} as you cast this spell.)
Target creature gets +2/+2 until end of turn. If this spell was kicked, that creature gets +5/+5 until end of turn instead.
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You're Not Alone 100%
$0.09#12730
"Target creature gets +2/+2 until end of turn. If you control three or more creatures, it gets +4/+4 until end of turn instead."
For the Family 100%
$0.14#17798
"Target creature gets +2/+2 until end of turn. If you control four or more creatures, that creature gets +4/+4 until end of turn instead."
Might of Old Krosa 100%
$0.29#9994
"Target creature gets +2/+2 until end of turn. If you cast this spell during your main phase, that creature gets +4/+4 until end of turn instead."
Flare of Faith 100%
$0.26#12571
"Target creature gets +2/+2 until end of turn. If it's a Human, instead it gets +3/+3 and gains indestructible until end of turn."
Mabel's Mettle 100%
$0.21#13498
"Target creature gets +2/+2 until end of turn. Up to one other target creature gets +1/+1 until end of turn."
Joint Assault 100%
$0.05#30042
"Target creature gets +2/+2 until end of turn. If it's paired with a creature, that creature also gets +2/+2 until end of turn."
Fistful of Force 99%
$0.10#28102
"Target creature gets +2/+2 until end of turn. Clash with an opponent. If you win, that creature gets an additional +2/+2 and gains trample until end of turn."
Will of the All-Hunter 99%
$0.10#24650
"Target creature gets +2/+2 until end of turn. If it's blocking, instead put two +1/+1 counters on it."
Take Heart 99%
$0.16#20116
"Target creature gets +2/+2 until end of turn. You gain 1 life for each attacking creature you control."