Though not as valuable as the Blastoise, fewer perhaps exist of the Chancey card
Its better than proliferating because the creatures dont have to already have the +1/+1 counters on them (although it obviously isnt going to help with other kinds of counters)
Additionally, we have several other support cards that work with the Dinosaurs in this deck, such as, for instance, Ixalli's Lorekeeper, a 1-drop that can create mana of any color, so your Dinosaurs can go on the board earlier and activate their abilities more often
It can open up the skies for an alpha strike by your team, and thats very strong
I got my butt handed to me so many times at local PPTQs by Esper Dragons, as my Siege Rhinos couldn't bear the might of Dragonlord Ojutai and Silumgar, the Drifting Death
Aetherdrift is especially exciting in this regard because it brings a burst of brand-new vehicles, a card type that pops up occasionally, but rarely in such numbers