Vret, Threadbane Sage

Vret, Threadbane Sage gains +0/+X, where X
is the number of nonland permanents with
entangled counters on them.
Whenever you put one or more entangled
counters on a nonland permanent, if Vret, Threadbane Sage is untapped, you may tap them.
If you do, each opponent loses life equal to Vret, Threadbane Sage's toughness.