mill that many cards instead mtg legendary octopus Supertype: Legendary, Subtype: Octopus, 11 Whenever you draw your first or second card each turn Cephalopods of the Multiverse –
Description
That effect helps aggressive decks churn through cards at a healthy rate, and it plays into the type of strategy Emberheart Challenger slots right into, with prowess decks often employing pump spells that target their own creatures

Why would we ever look back

Having more ways to get the mana you need when you need it streamlines every other part of the game, after all

Can that be a real deck