Veltrat, Soul Sovereign

Flying, indestructible
Veltrat's power and toughness is equal to the
number of +1/+1 counters on other creatures
you control plus one.
—Veltrat can't attack as long as it's power is less
than five.
Remove five +1/+1 counters from a creature: It
gains hexproof and indestructible until end of
turn.