avatar mtg commander deck The Lord of the Rings: Tales of Middle-earth Progenitus AVATAR Commander Deck EDH

Also, this cards name is a perfect summation of its effect always a nice touch for MTG cards

Theyre colorless or have the potential to be colorless when morphed and thus work well with Ugin, the Spirit Dragon and all of the colorless lands the deck rightfully plays

You also have to tap a creature to attack with it (unless the creature has some other kind of ability that prevents that from happening)

Unlike Mairsil combos, which required the setup of putting things into exile, Quicksilver Elemental just works with Vivi Ornitier

The art is that good

There are tons of other utility lands, so find some that have good synergy with you deck and decks theme