I've seen these cards draw a fair bit of hate in a game so be prepared for a crackback
As long as Snow Villiers is on the battlefield (and still a creature), that ability will count Snow Villiers itself.
Now, if I have a couple of cards from Tempest, like Furnace of Rath and Dark Ritual, Ill have to look them up
And even if they do, you could enhance Gleeful Arsonist's power to have it deal more damage when those few non-creature spells do come out
Black cards offer most of the value here, with Reanimate ($14.79 / 11.62), Rise of the Dark Realms ($20.99 / 16.49), and Necromancy ($17.18 / 13.50) among the most expensive Magic cards in the deck
"Tutor" / Utility / Flex Slots (8 cards): Cards that let you search for specific pieces, protect your board, or powerful "good stuff" cards