Trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.)
Whenever one or more creatures you control with
trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.) deal combat damage to a player, create an X/X green Dinosaur Beast creature token with
trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.), where X is the amount of damage those creatures dealt to that player.