Azamongar, Thunder King

At the start of each player upkeep, add 1 charge counter on this creature then that player may pay {1} for each charge counter on this creature. If it
is not paid, remove all charge counters from this creature and deal 1 dmg for each charge counters removed to that player and all creatures he
control. If that player is you, instead gain 1 life
for each charge counters removed.
Azamongar have +1/+1 for each charge counters
on it.