Shambling Sliver

Sliver creatures you control have "Sacrifice
this permanent: Put a +1/+1 counter on
target creature."
Sliver cards in your graveyard have Dredge 3
(If you would draw a card, instead you may put
exactly three cards from the top of your library
into your graveyard. If you do, return this card
from your graveyard to your hand. Otherwise,
draw a card.)