Leyara, Future of Alfheim

Eminence-If Leyara, Future of Alfheim is in your command zone or on the battlefield, elves you
control have "add {w}, {b}, or {g}".
Whenever you cast an elf spell, you may draw a
card and loose 1 life.
At the beginning of your end step, create X 1/1
white and green Elf creature tokens, where X is
the amount of mana both produced and used
with Leyara's ability.