Alpine Grizzly Ashcoat Bear Ayula, Queen Among Bears Balduvian Bears Bear Cub Beorn the Fierce Beorn, Reluctant Host Bosco, Just a Bear Copper Host Crusher Diregraf Scavenger Doc Aurlock, Grizzled Genius Dragon-Scarred Bear Drover Grizzly Druid's Familiar Duskana, the Rage Mother Evercoat Ursine Exuberant Wolfbear Fiendish Panda Forest Bear Friendly Teddy Gigantic Big Bear Golden Bear Goreclaw, Terror of Qal Sisma Grizzly Bears Grizzly Ghoul Hei Bai, Forest Guardian Hei Bai, Spirit of Balance Hurska Sweet-Tooth Koala-Sheep Kudo, King Among Bears Large Bear Little Bear Lumra, Bellow of the Woods Mother Bear Ordinary Bear Owlbear Owlbear Cub Pale Bears Phantasmal Bear Platypus-Bear Professor of Zoomancy Rampaging Yao Guai Razorclaw Bear River Bear Runeclaw Bear Ruxa, Patient Professor Spectral Bears Spirit of the Aldergard Striped Bears Studious First-Year Surrak and Goreclaw Ulvenwald Bear Ursine Fylgja Ursine Monstrosity Vastlands Scavenger Vivien's Grizzly Werebear Wilson, Refined Grizzly

Whats more, the card type of something like Underground River is just Land. This means that you cant target it using fetch lands types
If you play 40 lands and 10 mana ramp effects, that means half of your deck is mana, leaving little room for the other stuff
Chapters II and III being attack triggers to draw cards instead of combat damage is a little pushed, but at six mana and an extra turn in most circumstances you had better need a significant return on it like this gives
Booster Box includes 36 booster packs
On top of all of that, whenever Ulamog attacks, the defending player has to exile the top twenty cards of their library