Just once/turn though
The Ozolith gives you a non-creature permanent on which to store your counters and is a good mover of counters as well
Rex can be recruited as a companion if you help The King deal with some troubles going on in his turf, with his companion quest sending you on a search around the Mojave to find a replacement brain to swap for his degrading old one
Being a reskin of the angelic Legendary Planeswalker Elspeth Tirel, it's fitting that this card has also made Miku look regal and heavenly, almost like a royal priestess
These include some of the most powerful cards from throughout Magic's history, including Black Lotus, Time Walk, Brainstorm, and more recent cards like Dig Through Time and Narset, Parter of Veils
Similarly, replacement effects that modify how creatures you control enter the battlefield will see Arixmethes entering as a creature rather than a land