Elrond, Lord of Rivendell

{t}: Add one mana of any color. Spend this
mana only to cast an Elf, Dwarf, Halfling,
or Human spell.
At the beginning of your end step, As long
as you control an Elf, a Dwarf, a Halfling,
and a Human, create a 1/1 green Elf
creature token.