Last but not least, I threw in Evolving Door, which will let me pay 1 mana and sacrifice a creature to tutor up and exile a creature with one more color in its color identity than the sacrificed creature
They want us to keep getting engaged by using them
After Standard rotates, some of the cards will see price drops, but some of most expensive cards from the set stay at the top, like The Immortal Sun from Rivals of Ixalan or Finale of Devastation from War of the Spark
Although better early than the bigger card advantage effects the fact that Thoughtcast isn't really something you want to do early I tend to find I play heavier draw over it if at all
Honing in on your card pool may limit the selection, but it allows for a handful of specific but powerful cards that I think are interesting to run
This giant lizard is clearly meant for games of Commander, where the board can reach a critical mass of Dinosaurs