Green Dragon

Flying, Trample, Age-Up: {1}{g}{g} (add an age
counter as a sorcery), Age 2+: Forestwalk,
Age 3+: Menace, Age 4+: Deathtouch
Age (The creature enters the battlefield with 1
age counter. For each age counter, it gets +2/+1
and any benefits noted at specific ages. A creature
can't have more than 4 age counters.)
Whenever Green Dragon has an age counter put
on it, until end of turn, whenever a creature is
dealt damage, destroy it.