Hammer tends to play poorly from behind, so they need a certain density of ways to protect their threats as they play an all in, protect the queen style of game
At San Diego Comic Con, a bunch of MTG Doctor Who spoilers were revealed, showing new Planechase cards, creatures, sagas and more from the upcoming MTG Doctor Who crossover set
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A card like Sphinx's Revelation draws you double the cards with this in play, and many commanders in these colors have guaranteed ways to gain life
One last relevant bit of information: cards with anything but the old borders aren't legal in Premodern
I mean, sure, youve got Rekindling Phoenix and Glorybringer or whatever, but to just shut off the vast majority of creatures indefinitely