Rapid Augmenter 
Creature — Otter Artificer
$0.41 #7998 0.12 2.2 years
Haste
Whenever another creature you control with base power 1 enters, it gains haste until end of turn.
Whenever another creature you control enters, if it wasn't cast, put a +1/+1 counter on this creature and this creature can't be blocked this turn.
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Cards similar to Rapid Augmenter expected a card that isn't here?
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"Whenever another creature you control with power 2 or less enters, target creature you control gets +1/+1 until end of turn."
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"Whenever another creature you control enters, put a +1/+1 counter on that creature and a +1/+1 counter on this creature."
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"Haste"
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"Whenever one or more other creatures you control with base power and toughness 1/1 enter, put a +1/+1 counter on this card."