Rikku, Resourceful Guardian allows you to force a creature through your opponents' blockers, as well as steal counters, and Lulu, Stern Guardian protects you by putting stun counters on your opponents creatures, as well as proliferating to keep them around
Giving all your Rush characters Evasive means they can come down, remove something and then stick around to quest for you or just keep making favorable trades
For myself, I kind of a wayside fan at this point, where I play one of the games every now and then and follow news, but I'm not as hyped at every announcement
Dash Parr Lava Runner appears as a four-cost amethyst card with Rush and a special ability called Record Time thats basically an improved version of Rush, allowing him to quest the turn hes played rather than just challenge
Two more Commander legends, Locke and Mog, round out the bonus cards