No one knows whats going to happen
It forces all lands to only be able to be tapped for one color instead of what colors it could normally produce

Morophon, Provider for Poultry | Commander | Bruce Richard Commander (1) 1 Morophon, the Boundless Creatures (19) 1 Adaptive Automaton 1 Avian Changeling 1 Beast Whisperer 1 Chameleon Colossus 1 Chicken a la King 1 Chicken Egg 1 Elvish Farmer 1 Free-Range Chicken 1 Game-Trail Changeling 1 Goblin Bookie 1 Mesa Chicken 1 Metallic Mimic 1 Mirror Entity 1 Mothdust Changeling 1 Poultrygeist 1 Shapesharer 1 Taurean Mauler 1 Venomous Changeling 1 Zodiac Rooster Instants (12) 1 Anguished Unmaking 1 Assassin's Trophy 1 Beast Within 1 Crib Swap 1 Dismantling Blow 1 Generous Gift 1 Force of Vigor 1 Harrow 1 Nameless Inversion 1 Swords to Plowshares 1 Utter End 1 Worldly Tutor Sorceries (8) 1 Cultivate 1 Distant Melody 1 Harsh Mercy 1 Hurricane 1 Kindred Dominance 1 Kodama's Reach 1 Vanquish the Foul 1 Vindicate Enchantments (8) 1 As Luck Would Have It 1 Doubling Season 1 Etchings of the Chosen 1 Fowl Play 1 Kindred Discovery 1 Mirari's Wake 1 Primal Vigor 1 Radiant Destiny Chickens Mesa Chicken is a 2/2 flyer creature as long as you have no shame

Weve got the spells for it, weve got the creatures for it, and weve even got ways to mill ourselves (increasing our chances of obtaining Spell Mastery) as well as ways to get paid from the milling it does
I really want to share this feature I just discovered in Arena Tutor's Collection tab
If your opponent has something really dangerous, Teferi's -3 ability can take care of it, removing it from the battlefield for several turns