A three-mana creature attacking with first strike and haste means that its probably connecting if your opponent doesnt immediately have a removal spell, and when that happens, you get a Treasure for your trouble
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Act of Heroism Adeline, Resplendent Cathar Ajani, Mentor of Heroes Amateur Hero Anthousa, Setessan Hero Aragorn, Hornburg Hero Benalish Hero Blur of Heroism Brigid, Hero of Kinsbaile Changeling Hero Chronicler of Heroes Colossal Heroics Contract Hero Crovax, Ascendant Hero Devoted Hero Dreamtail Heron Earth's Mightiest Heroes Elspeth, Undaunted Hero Fabled Hero Folk Hero Forge of Heroes Frodo, Determined Hero Frontline Heroism Gerrard, Weatherlight Hero Goblin Hero Heartfire Hero Hercules, Olympian Hero Here Comes a New Hero
This cat can shut down lifegain decks for as long as it's on the field, get around fog effects, and punish players who run a lot of non-basic lands (which is a high percentage)