A'rakune, the First Spider

Indestructible
Reach
Whenever you cast a spell, create X 2/2 green spider creature tokens, where X is half that spells mana cost, rounded up.
If you have 8 or more spider creatures under your control, deal 5 damage to target non-spider creature.
If a spider spell was cast on any player's turn, target player loses 4 life or sacrifices 4 permanents.