korlash, slayer of logic

Korlash, slayer of logic enters the battlefield with
four +1+1 counters on it
put a +1+1 counter on Korlash, slayer of logic: discard your hand for each card less than seven pay 3 life you activate this ability only once each turn
remove three +1+1 counters from korlash, slayer of logic: draw a card and lose 1 life you activate this ability only once each turn
remove ten +1+1 counters from korlash, slayer of logic: destroy all other creatures each player loses 5 life for each creature destroyed thi