The treasure and card draw on the -3 is very solid, but the +2 effect is the true subtle strength of this card
Howlsquad Heavy At this point, we have so many Goblin Rabblemaster variants that we need to pick and choose which ones are worth playing
Cards like Minsc & Boo, Timeless Heroes, Otharri, Suns' Glory, and Wistfulness provide immense value and are very hard to interact with profitably, even in powered formats
If you need a sample, look up Mystic Forge and Foundry Inspector
By tacking an extra 3 mana onto the cost of any permanent in your deck, you can simply put it onto the battlefield
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