Many in-universe Magic villains are also Grixis aligned, including the Draconic despot Nicol Bolas, the Phyrexian corrupted artificer Mishra, and the card draw loving lich lord Nekusar
With these spoilers, it looks like Ravensburger is trying to promote certain ink color combinations outside of just using the powerful Dual Ink cards
With Play Boosters, basic lands (including traditional foil versions), a promo card, a box to store it all, and more, the Bundle is a convenient way to explore Modern Horizons 3 that any fan will appreciate
This becomes annoyingly powerful if you can bounce it or blink it
Normally, you pay a bunch of life into them and get the cards at your end step
These are going to be a big part of mana bases in multiple formats for years, including Modern and Commander, as they let you find the right basic on schedule while providing very minor deck thinning