The downside is that Muldrotha will be an instant target for your opponents to remove, letting you stick your Kotis for a bit longer
Its also a 3/3 Flying Menace, which is a great starting point for building up a Commander damage smackdown
If you want your artifact deck to end the game quickly, this is your card
Sidisi, Undead Vizier is a commander that demands a sacrifice, which can be itself or another lowly creature you have floating around
Ive really enjoyed the willingness of Wizards of the Coast to collaborate with loved video game IPs, with Assassins Creed and Fallout previously offering some unique twists on the formula
Im playing nineteen lands, which is fewer than most control decks in Legacy, so I want my cantrips to cost one because its frequently their job to find me more lands