Dinosaur decks typically focus on winning through combat, so youll have plenty of chances to draw cards whenever your dinos deal combat damage to a player
Which Yu-Gi-Oh! spell card do you think has the most mystical potential

Absorbing Man Adrix and Nev, Twincasters Aesi, Tyrant of Gyre Strait Alaundo the Seer Ambassador Blorpityblorpboop Ant-Man, Colony Commander Ant-Man, Reformed Rogue Arixmethes, Slumbering Isle Arwen Undmiel Beast, Erudite Aerialist Berta, Wise Extrapolator Blue, Loyal Raptor Bonny Pall, Clearcutter Brawn, Amadeus Cho Clement, the Worrywort Crdan the Shipwright Doc Aurlock, Grizzled Genius Druneth, Reviver of the Hive Duggan, Private Detective Edric, Spymaster of Trest Elrond of the White Council Elrond, Master of Healing Erestor of the Council Esix, Fractal Bloom Eutropia the Twice-Favored Experiment Kraj Ezuri, Claw of Progress Ezuri, Stalker of Spheres Galadriel of Lothlrien Galadriel, Elven-Queen Gandalf, Westward Voyager Genghis Frog Gor Muldrak, Amphinologist Gretchen Titchwillow Grolnok, the Omnivore Guru Pathik Hakbal of the Surging Soul Ignis Scientia Imoti, Celebrant of Bounty Inga and Esika Ivy, Gleeful Spellthief Jackal, Genius Geneticist Jolrael, Voice of Zhalfir Jyoti, Moag Ancient Kaseto, Orochi Archmage Kellan, Inquisitive Prodigy Keruga, the Macrosage Kianne, Corrupted Memory Kimahri, Valiant Guardian Kinnan, Bonder Prodigy Kinnan, Bonder Prodigy Kiora, Sovereign of the Deep Koma, Cosmos Serpent Koma, Cosmos Serpent Koma, World-Eater Korlessa, Scale Singer Kruphix, God of Horizons Kumena, Tyrant of Orazca Kydele, Chosen of Kruphix Legolas, Counter of Kills Lonis, Cryptozoologist Lonis, Genetics Expert Madame Vastra Marcus, Mutant Mayor Mikey & Don, Party Planners Momir Vig, Simic Visionary Moon Girl and Devil Dinosaur Moritte of the Frost Nadu, Winged Wisdom Nael, Avizoa Aeronaut Nicanzil, Current Conductor Omega, Heartless Evolution

If you can untap it multiple times, you can wreak plenty of havoc
Then later you can tap it, remove a number of time counters, and exile Hourglass to return all nonland permanents with mana value equal to the time counters removed from your graveyard to the battlefield