Cards like Rhystic Study and Mystic Remora are staples in high-power Commander
While not technically Rush, the Jafar - Dreadnought can shift onto the smaller Jafar and attack immediately, so it can fill the same role as a reactive card
For tournament play in NA/EU, English boxes are the right buy
The Lord of the Rings: Tales of Middle-earth Elven Council Commander Deck set includes 1 ready-to-play Green-Blue deck of 100 Magic cards (2 Traditional Foil Legendary Creature cards, 98 nonfoil cards), a 2-card Collector Booster Sample Pack (contains 1 Traditional Foil or nonfoil special treatment card of rarity Rare or higher and 1 Traditional Foil special treatment Common or Uncommon card), 1 foil-etched Display Commander (a thick cardstock copy of the commander card with foil etched into the cards border and art), 10 double-sided tokens, 1 Helper card, 1 deck box (can hold 100 sleeved cards), 1 Life Wheel, 1 strategy insert, and 1 reference card
Here are the best options to buy based on what you're looking for and what you need to get started
(It cant be blocked except by two or more creatures.) Hail HYDRA