Furnace sliver

All Slivers are phyrexians.
At the beginning of your upkeep put an oil
counter on each sliver you control. Slivers you control have "This creature has +1/+1 for each
oil on it" and "remove two oil counters from
among slivers you control: this creature deals 1
damage to any target"
"Though phyresis seemed to stop in other species, oil still flowed through the blood of many slivers, quickly infecting entire hives"