Well, there arent a million Dinosaurs its good to copy after theyve attacked, but it could still be a good include in a Dinos deck, especially given it transforms permanently
Don't let your vision remain a concept
Ive also glossed over most of the players cant draw cards effects like Omen Machine, Mornsong Aria, and Possessed Portal, since those get into some pretty janky combo territory and are inherently different cards on their own
And even if you didn't, you could still play Historic that allows you to use cards now not Standard-legal you wouldn't need to stress about your deck being rotated out of use
At lower power levels, youre not going to see cards like Entomb, but thats another discussion entirely, and youll see why Im less concerned with that later
When this creature leaves the battlefield, draw a card for each +1/+1 counter on it