There are a handful of expensive cards entering the Standard format that players can open from their play boosters
But keep in mind, it's only current characters that lose their strength.
While there may be other cards that offer similar effects, Mila's versatility in providing card draw, graveyard recursion, and a powerful emblem makes her a strong contender for inclusion in decks that can effectively utilize her abilities
If blue decks are desperate for cheap ways to spend their mana, this could get edged out by Geistwave, but it looks like a contender
Saffgor: Where this gets interesting is when it's cast at flash speed, as ending the opponent's turn with a wipe seems truly devastating
He comes in indestructible and his ability automatically triggers at end step, so this feels sort of like an Etali where you pay one mana more to guarantee at least one trigger while also draining your opponents for a bunch of life