Malum Treefolk

Flash, Can Not Be Countered, Lifelink
Malum Treefolk enters the battlefield with X +1/+1 counters on it.
At the beginning of your upkeep, double the number of +1/+1 counters on Malum Treefolk.
Malum Treefolk has Trample and Hexproof as long as it has ten or more +1/+1 counters on it.