This spell can't be countered.
Bloodthirst X (This creature enters the battlefield with X +1/+1 counters on it, where X is the damage dealt to your opponents this turn.)
Protection from instants
Protection from instants works only while Petrified Wood-Kin is on the battlefield. It can be targeted by instant spells or abilities of instant cards while it’s on the stack or in any other zone but on the battlefield.
“Protection from instants” means instant spells can’t target it, damage that would be dealt to it by instant sources is prevented, and it can’t be the target of abilities of instants (such as Haunt).