Elf Berserker

If green mana was used to cast Elf Berserker, Elf Berserker enters the battlefield with two +1/+1 counters on it.
If white mana was used to cast Elf Berserker, Elf Berserker gains +0/+2 and Vigilance.
If red mana was used to cast Elf Berserker, Elf Berserker gains +2/+0 and Haste.