Courageous Goblin 

Creature — Goblin
Whenever this creature attacks while you control a creature with power 4 or greater, this creature gets +1/+0 and gains menace until end of turn. (It can't be blocked except by two or more creatures.)
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Cards that do something similar expected a card that isn't here?
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Quilled Charger 91%
$0.07#25336
"Whenever this creature attacks while saddled, it gets +1/+2 and gains menace until end of turn."
Hand That Feeds 88%
$0.07#23248
"Whenever this creature attacks while there are four or more card types among cards in your graveyard, it gets +2/+0 and gains menace until end of turn."
Smelted Chargebug 82%
$0.16#18151
"Whenever this creature attacks, you may pay {E}. If you do, another target attacking creature gets +1/+0 and gains menace until end of turn."