It was. Each time you'd go into a PVP & win, you'd get an attack bonus in the next battle, as long as you initiated within a 10 minute time frame. By the time you hit 20 wins in a row, you'd be hitting with 10x attack, plus any event card bonuses. You'd be hitting similarly powerful decks. If I remember right, achievements were on a5 tier system. Every time you'd complete a tier, you'd get a ultra rare "power up"card. The first would max out at level 20. Complete tier 2, collect that card, max it & fuse it to the 1st. Max that one to level 35. By the time you collect the 5th & max it, you'd have a level 80 ultra rare powerhouse (*cough combiner cough*). At the end, you'd get rewards just like in raid boss events. But there was so much more going on & some prizes actually helped in future events. Mobage still made money. But the set up for this type of event was just fun. Not to mention there was a ticker at the top of the screen where you could send messages to other players & talk smack back & forth!