When this creature enters, target artifact you control gains "{T}: This artifact deals 2 damage to any target" for as long as you control this creature.
This land enters tapped. {T}: Add {R} or {G}. {2}{R}{G}: Until end of turn, this land becomes a 3/3 red and green Elemental creature with "Whenever this creature attacks, put a +1/+1 counter on it." It's still a land.