After all, why tap a land for 2 mana when you can play a card like Frantic Search and effectively tap it for 3, or use a Snapcaster Mage to just have your Islands tap for 3 mana outright before using a Time Spiral to refill your hand and untap your lands
Last Chance Extra turns can be frustrating to play against if your opponent is unable to piece together a win
You have no maximum hand size
Whether a three or more color deck is viable usually has a lot more to do with individual power outliers than the available non-basic lands
The planeswalker types are Ajani, Aminatou, Angrath, Arlinn, Ashiok, Bolas, Chandra, Dack, Daretti, Davriel, Domri, Dovin, Elspeth, Estrid, Freyalise, Garruk, Gideon, Huatli, Jace, Jaya, Karn, Kasmina, Kaya, Kiora, Koth, Liliana, Nahiri, Narset, Nissa, Nixilis, Ral, Rowan, Saheeli, Samut, Sarkhan, Serra, Sorin, Tamiyo, Teferi, Teyo, Tezzeret, Tibalt, Ugin, Venser, Vivien, Vraska, Will, Windgrace, Wrenn, Xenagos, Yanggu, and Yanling
These lands are simultaneously great for artifact decks, and dangerous for Commander