Split waystone into two creatures vs aggro like yeti. I would cut sive n play a fourth if I had the 4th copy.
It is better to play a dinosaur nest on turn two than waystone on turn 1 with contract unless opponent is like yeti aggro
Curtain call is strong combat trick that gives alot of life n protects vs wipes.
This deck has many good creatures vs spot removals.
Serasaur is strong aggro clock in the current meta with many relics
U can fetch dawn walker vs midrange controlish decks n recur with echo dinosaur to grind them
The other two cost cards are superior vs exploit.
banish is fine too but I find eavesdrop very good to have as it will almost never be a dead card and great in attrition/disruption vs graveyard based strategies