Gyarda, Death Drinker

Whenever Gyarda attacks, you may remove any
number of +1/+1 counter from creatures
you control. Draw a card and lose 1 life
for each counter removed this way.
If you have at least seven cards in hand, creatures
you control have undying (whenever this permanent
is put into the graveyard from the battlefield, if it had
no +1/+1 counters on it return it to the battlefield with
a +1/+1 counter)