Kodama of the West Tree, for example, grants modified creatures trample and also allows you to grab a land from your deck and put it into play when a modified creature you control does combat damage to a player
The sideboard is the area that has gotten the biggest facelift, with basically only Deputy of Detention surviving from the previous sideboard options
Squee, the Immortal Squee, the Immortal is vastly superior to its 1/1 counterpart
These two cards are legal in Pioneer and have been relatively fine considering how unhinged they can be given the right surrounding cast
In order to unlock the special (and often quite powerful) effects found on the flip side of each Battle you'll need to reduce those counters to zero by either attacking said Battle or by using certain types of spells to damage it or remove its counters
Ultimately, Dinosaurs are an incredibly fun creature type to explore, so lets swoop down, much like a Pteranodon, and explore the best Dinosaur cards for Commander