Smeargle, Aspiring Artist

Haste, Moody (At the begging of every upkeep flip a
coin, if heads gain (+1/+0 ) if tails gain (+0 /+1)
{8} Sketch (Make a non-legendary token copy of
target creature and give it haste, sacrifice it at the
end of the turn
It marks its territory by using its tail like a paintbrush.
There are more than 5,000 different marks.