Red Dragon

Flying, Haste, Age-Up: {1}{r}{r} (add an age
counter as a sorcery), Age 2+: Mountainwalk,
Age 3+: Menace, Age 4+: Trample
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 Red Dragon has an age counter put
on it, it deals damage equal to its power to target creature or planeswalker.