Nymeria, Elf Ball Elite

{t}: add {w} or {g}
{w}{g},{t}: create a 1/1 elf creature token
{g/w}{g/w}{g/w}{g/w}{g/w}: Target land becomes an X/X creature with Haste, Trample and Vigilance
where X is the number of elf's you control

whats an elf ball