vine Elemental

when Vine Elemental enters the battlefield, for every Elemental creature you control, put a 1/1 spirit elemental token on the field with "when this creature dies, add {g} to your mana pool."
you may sacrifice an elemental creature you control. if you do, Vine Elemental gains power
and toughness equal to the sacrificed creatures power and toughness until the end of the turn.