The Brothers War picks up right where DMU left off, with Teferi somehow opening up a portal to the past in order to try and figure out how to work Karns Sylex, rebuilt by Saheeli
That said, unless you are planning on opening a lot of boxes (to help even out variance), I'd probably plan on getting the non- Masterpiece value and treat the possibility of opening a super-sweet, super-expensive Invocation as a bonus lottery ticket that you get for free when buying a box of Amonkhet
Two-damage pinging is nice, but frankly this design should have been saved for a snapping turtle or something
though this has been achieved with numerous card games in the past, and is a feature present in several Living Card Games (or LCGs
Pokemon has a plethora of introductory products that were created with new players, young and old, in mind and my recommendation is the Pokemon Battle Academy