Mint cards are the pinnacle of collecting
Aether Vial is an amazing way for creature decks to "cheat" on mana, effectively deploying more creatures for less mana while also dodging counterspells
Finally, its VStar ability, Starbirth , aims to search for two trainer-type cards from your deck, which is extremely useful and thanks to that, used in many decks in the Metagame since its launch, reinforcing its competitive value and, moreover, a commercial reflex
To calculate the mana value of a split card, just add the mana values of each half
This means that Mew ex wont always be useful, but right now, when you are likely to come up against Colourless or Steel-type decks often, they can come in good use
But the advent of stronger and more Commander-focused card designs in products like Commander Legends has provoked a strange ennui in some players