Unearthed Sapling

Put a Growth counter on Unearthed Sapling. During your upkeep, if Unearthed Sapling has a Growth counter on it, add another one. If Unearthed Sapling has at least one Growth counter, it cannot be untapped by any mean.
If at the beginning of your upkeep Unearthed Sapling has 4 growth counters on it, sacrifice Unearthed Sapling and put into play a 4/5 Ancient Oak green token thats counts as a Treefolk. .