Avakar God of day and night

Flying, indestructible
When Avakar god of day an night enters the
battlefield it becomes day, you draw a card and
gain 3 life .
when Avakar leaves the battlefield it becomes
night, each opponent loses 3 life
and discards a card.
at the beginning of your endstep exile Avakar and
return it at the beginning of your next upkeep.