My Suggested rewards:
lvl 250 = A mythical box (one mythical card)
300 = Plasma Fortress
350 = Platnium Fortress
400 = Electric Fortress
450 = Defense Matrix
500 = one mythical pack (five mythical card for one
501 or above (disable max level pls): every time level up = +250 tokens. XP Points on every level above 500: 5,000,000