When stood using the skills of the grade 4 unit Vict Ten or the stride support card Mecha Battler Victor, Gambler will already have a +5000 power boost placed on him, and with his generation break will hit a minimum of 18000 power. This is just enough to make a crossride like Big Bang Knuckle Buster drop 10000 shield, but if Gambler's skill sends a unit with at least 9000 power to the drop zone he'll attack for 23000 power, making his second attack dramatically more powerful than his first.
Magical Gambler's skill also helps set up for legion skills, building on the tangible advantage that's been created for going second. With effective stride units like Vict Ten and Vict Plasma available there's no incentive to drop more cards than necessary to guard, or arbitrarily force oneself into legion by other means, since a large portion of Nova Grappler's midgame is now spent on grade 4s. Magical Gambler naturally builds towards legion, stacking on top of the cards discarded to pay the cost for stride. While Nova Grappler's only viable legion units at this time are Mega Flare and Drill Wing, neither of these cards require Raizer rearguards in order to function. So Gambler can serve a variety of mixed offensive and setup roles depending on the type of deck he's used in, and by playing with the minimum numbers of 13~18000 in mind can be counted on for reliable offense.
