The goal of an aggro deck is to hit with smaller creatures early on to expedite a win, which is best done in mono red (looking at you, goblins) or Gruul decks
It can also be combined with other treasure token generators to more consistently give you the win
There Once Was a Cycle from Unglued In Unglued , I did a cycle of cards that all had an effect right away and at the start of the next game with the same opponent
(Regular sized for Magic, Pokemon, Race for the Galaxy, Thunderstone, Pandemic, etc.)
Propeller Pioneer Propeller Pioneer has flavor text that makes you want to play it, but in todays EDH, I dont think its even playable if you lop a mana off its casting cost
But its pretty much a color-shifted Melira, Sylvok Outcast for decks that might not want to deal with the legendary creature clause