Arasta of the Endless Web (PTHB 165p)

Legendary Enchantment Creature — Spider • Mana cost: {2}{G}{G} • Theros Beyond Death Promos • Rare

Reach
Whenever an opponent casts an instant or sorcery spell, create a 1/2 green Spider creature token with reach.

Her webs, spun from her own hair, reach from Nyx to the mortal world and even into the Underworld.

Illustrated by Sam Rowan.