One of the interesting design challenges with eternalize involved figuring out how to capitalize on the fact that the token copy was a 4/4
His 7,000 Power is no laughing matter and will force Counters if opponents want to protect a rested Character or their Leader from OP06-114-wyper's attack
Eladamri, Korvecdal Eladamri, Korvecdal gives you card advantage and an inexpensive way to cheat out a creature from your hand or play it from the top of your deck
Magic is already a prohibitively expensive game for many, so a mechanic that makes it more so is unlikely to break out of development
While youve got Phyrexian Mite tokens from the land Mirrex, you can also create spirits using Phantom Interference, Three Steps Ahead and Sunfall
Zirda, the Dawnwaker Zirda, the Dawnwaker is the other Companion on this list, but while Lurrus represents somewhat fair Magic, Zirdas primary uses are going to be considerably more degenerate