Ariel, Arachnoid Demon Lord

First Strike, Deathtouch, Reach
{t},{b/g}{b/g} Create 2 1/2 Green Spider Tokens with Reach
Eminence — Spider spells you cast, except for this card, cost {2} less to cast.
When another Spider creature you control dies or is exiled by an opponent's card, deal damage to that opponent equal to that card's Mana cost.