Era of Innovation goes infinite with cards on the top of this ranking and something that nets mana on sacrifice, like Ashnod's Altar
Mewtwo and Charizard are naturally dominating the meta so far, but one outlier comes via Misty, whose heads or tails effect is driving many up the wall
While this trait (plus being indestructible) was what earned it my attention when talking about good reanimator commanders, you can just as easily build your Orzhov deck around creatures with powerful ETB effects and ways to kill them off to do a good impression of a traditional blink strategy too
Players may respond to that ability knowing the value of X
You can Macabre Mockery something out with a strong enters-the-battlefield trigger, such as their Ravenous Chupacabra, and then kill a creature on arrival
Raffine, Scheming Seer Raffine, Scheming Seer is cheap and a 1/4 flier with ward 1 defends itself well