Umbral Spell and Tenebrous Spell

[Expletive]

Tenebrous Spell:

A tenebrous spell uses up a spell Slot one level higher than the spell’s actual level, except in the case of spells with the darkness or shadow descriptor or of the illusion (shadow) subschool; this feat does not change the effective level of those spells (but still counts as using a metamagic feat for all other purposes).

Umbral Spell:

An umbral spell gains the darkness descriptor. *snip*
Level Increase: +2

Question: If I want to cast an Umbral Tenebrous Mage Armor spell, can I apply tenebrous spell for +0 cost, since it gains the darkness descriptor from Umbral spell?