Oxgrogon

Oxgrogon attacks a random opponent or planeswalker each turn if able (it may randomly
attack your own planeswalker).
When Oxgrogon attacks and is not blocked,
sacrifice a forest you control and phase out
another green creature you control.
During your precombat main phase you may tap Oxgrogon. If you do not, put two -1/-1 counters
on it.