This is, hands-down, the most popular way to build a deck
Starting Town, for example, improves the deck's colored mana consistency in archetypes like Jund Roots, Boros Mice, Orzhov Sacrifice, Jeskai Artifacts, Rakdos Aggro, Jund Midrange, Esper Pixie, and more
Add Lord Windgrace to a different Jund deck and we get what he adds without worrying about investing an entire deck into something we already have
The full titles for the seven cards revealed so far are Stitch - Rock Star, Elsa - Snow Queen, Cruella de Vil - Miserable as Usual, Maleficent - Monstrous Dragon, Robin Hood - Unrivaled Archer, Captain Hook - Forceful Duelist and Mickey Mouse Brave Little Tailor
Revisiting the beloved MTG plane of Kamigawa sees the return of Ninjutsu to Standard, as well as two new planeswalkers
Games that hinge on late-game resource battles where mana efficiency decides turns