Shadra, Mother of Venom

Indestructible, Infect, Blood Price (During your
end step, you may sacrifice any number of creatures.
Put a number of worship counters on Shadra equal to
their power.)
If Shadra has less than 8 worship counters, it's
not a creature.
Whenever a creature you control deals damage to
an opponent, you may put a -1/-1 counter on
target creature.