Oktagon, from their first [[set ]] of [[Ixalan]], made a uniform system for PW leveling. Since then, all Planeswalkers released obtain their abilities when the units digit of their level is 6 or zero : 6, 10, 16, 20, 26, 30, etc. Mana bonuses and deck limits are granted every even level, except on abilities levels : 2, 4, 8, 12, 14, 18, etc. And an amount of HP is added every odd level, or Planeswalker Regeneration : 1, 3, 5, 7, 9 etc. With more recent Planeswalkers, the HP added is lower at low levels, presumably as an additional incentive to level up.