Madlion, Seeker of Time

Protection from instants
At the beginning of your upkeep put a knowledge counter on Madlion, Seeker of Time. For every counter on Madlion, Seeker of Time add {1} to your mana pool.
At the beginning of your end step if you have 6 counters on Madlion, Seeker of Time, {t} remove all counters and take an additional turn.