River Monsters

When River Monsters enters the battlefield, it explores, then it explores again. (Reveal the top card of your library. Put that card into your hand if it's a land. Otherwise, put a +1/+1 counter on this creature, then put the card back or put
it into your graveyard. Then repeat this process.)

When River Monsters dies, exile it and create
a 4/4 blue and green dinosaur token named Spinosaurus.