They have been high-value reprints for more than one set, and they have a vested financial interest in making these cards legal again
And yes, I do think Runic Armasaur should've been a White card, but this was back when White wasn't allowed to draw cards and Green was allowed to eat the entire color pie
Battle for Baldur's Gate narrows the focus to the titualr city and its surrounding stories, but still finds time to include bits and pieces from the wider D&D mythos
It can even banish itself from the graveyard to banish one card on the field if you control an Xyz with both a spell and trap card as material
From the looks of things, Wizards of the Coast is going to let the Allosaurus Rider Neoform deck be legal post-transition to the London Mulligan rule for at least some time, so having access to Force of Negation helps prevent you from dying to nonsense before you even manage to cast an Aether Vial
I figure it was only fair to have one card reward, um, let's call it experience