Fierce Guardianship would not cast.
Competitive Brawl match. Opponent had Lithliss (sp?) a mono-red dragon commander that creates 5/5 dragons when another dragon ETBs, I had my commander Koma, Cosmos Serpent out and Fierce Guardianship in my hand. Opponent casts a dragon spell, I tried countering with fierce guardianship, but I was not even given the option to cast it. No other card that I could see would have prevented the cast. Unfortunately I accidentally ended the match before I could take a screenshot, but I finished that game on my account just before posting this.
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Rezzahan#77802
commented
Fierce Guardianship can only counter a noncreature spell. And while there are a few noncreature Dragon spells, courtesy of the Kindred card type, usually a Dragon spell is a creature spell.