Cards like Overwhelming StampedeOverwhelming Stampede and Triumph of the HordesTriumph of the Hordes can turn your opponents' threat assessment on its head by making even a few Dinosaurs into lethal threats
For long-term investors Prismatic Evolutions
Blight Curse Commander Blight Curse is all about -1/-1 counters, a theme Wizards of the Coast hasn't done anything with for years, so fans are pretty excited
As noted, finishers are hard to come by for Selesnya sometimes, and Brawl decks need cards to punch through damage instead of sitting around on the ground
Avacyn is very important to the strategy, so you want to be able to cast that as quickly as possible
It is definitely a slow card, but will be good enough in the later part of the game to consider taking highly This provides a bit of ramp, and then in the later part of the game it is a great place to sink your mana, as venturing over and over again is some nice value