One reason for this, Rasmussen says, is: "I don't know that it's going to be a strictly power level sort of thing." He gives the example of Lotus Petal - not the most powerful mana accelerant, but a card that raises eyebrows, and might warrant a higher place on the table than might be expected
Your guess is as good as anyone's as to why that is
Earning 40 points or more rewards you with the mythic rare Ashiok, Wicked Manipulator Prestige avatar
To that end, he confirmed that they are going to ensure Standard, booster drafts, and other tabletop formats remain intact the way they are now, without the digital-only mechanics available in Historic
Once enough charge counters have been placed on it via the Station ability, it becomes a 7/7 Flying artifact creature