Rapid Augmenter
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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Official rulings (3) · Scryfall
Some creatures have base power and toughness 0/0 and an ability that gives them a bonus based on some criteria. Those are not characteristic-defining abilities, and that ability doesn't change its base power.
Normally, a creature's base power is the power printed on the card or, for a token, the power set by the effect that created it. If an effect modifies a creature's power without setting it, that is not included when determining its base power.
If a creature has a characteristic-defining ability that sets its power, indicated with a */* or similar in the power and toughness box, that ability is taken into account when determining its base power.