Zarramonde, the Obliterator

Zarramonde, the Obliterator
Legendary UnitDemonCost: 10ATK: 11 HP: 11
Arrives: If you played Zarramonde from your hand, destroy a unit, hero, worker, upgrade, or ongoing spell.
Untargetable, obliterate 4 (Whenever this attacks, destroy the defender's four lowest tech units first.)
BlackDemonology Tech III

Obliterate X Rulings
Obliterate never targets. Having resist or being untargetable doesn't help against obliterate. — Sirlin
If there are any units that are indestructible or that can't leave play, ignore them when looking for the lowest tech unit. If such a thing would be their "lowest tech unit" then instead destroy their next lowest. — sharpo
Untargetable Rulings
Something that's untargetable still CAN be attacked. It can even be affected by some spells and abilities, but NOT spells or abilities that use the [target] symbol. — Sirlin