The full contents of Dominaria Remastered Draft Boosters are: 910 Commons* 3 Uncommons 1 Rare or mythic rare 1 Retro frame card of any rarity** 1 Retro frame basic land 1 Token/ad card (*A traditional foil card of any rarity replaces a common in 33% of Draft Boosters
No one seems to be regulating Lorcana playmat size right now, but Ravensburger sells plenty of official ones, so we can tell you their average size
By the third turn when you drop it it's highly likely that something is in a graveyard
You could then use Thran Temporal Gateway to put them onto the battlefield on the cheap, get zippy with Blackblade Reforged with a side of Heros Blade, and do something absurd with Helm of the Host
What constitutes a "generically useful card" is all my personal opinion, of course
While making those cards, we realized that we could design cards where you could play either side A or side B and it never transformed