The first is mobilize, the Mardu mechanic, which is a creature mechanic that triggers when a creature with mobilize attacks, creating a number of 1/1 red Warrior creature tokens that enter attacking
Go out there and catch 'em all
More than 30 Pokmon and Trainer cards with special illustrations
Both are nice additions to the Starter Decks already being offered from previous sets, and they're both built in a way that should be easy enough to learn from a newcomer's perspective
Doubling Season Doubling Season from Ravnica: City of Guilds hasn't made much of a splash in 60-card formats, but it goes in many different Commander decks of all varities, because it straight-up doubles things players care about, like loyalty counters on Planeswalkers, for example
(inkdecks.com) Next Steps Build: Start with 4 Pegasus, 3-4 Genie, 3-4 Stand Out, 2-3 Mother Knows Best, 2-3 Under the Sea, 2-3 Max Goof - Chart Topper, 2 John Silver, plus your favorite Emerald fillers