Tar Pit

At the beginning of your upkeep, put a Tar counter on Tar Pit.
If there are three or more Tar Counters on Tar Pit, put a growth token into play. Treat this token as a 4/1 First Strike, Haste
If there are ten or more Tar Counters on Tar Pit,
put an exact copy of it into play under your control.
Spells or abilities which target creatures cannot target Tar Pit.