You can also cast Zacama, Primal Calamity on the cheap and still untap all of your lands to have access to even more mana to use to cast Dinosaurs or activate Zacamas abilities
Needless to say, thats a powerful effect - and, thanks to the Reserved List, its not one well be seeing again any time soon
I like how this still keys off colorless mana, even if that is a drawback
Spend any amount of mana, reshuffle your top for that many cards - I get that cards like Scroll Rack and Senseis Divining Top exist but if youre building for budget or redundancy, and you have access to blue, consider Soothsaying instead
It can work as a last resort, but it frequently leads to a lower quality of work or to trouble with sourcing the artist of a piece