Ashling, the Limitless (Borderless)

Elemental spells you cast from your hand have evoke 4. (If you cast a spell for its evoke cost, it's sacrificed when it enters.)
Whenever you sacrifice a nontoken Elemental, create a token that's a copy of it. The token gains haste until end of turn. At the beginning of your next end step, sacrifice it unless you pay WUBRG.