Splicing only adds to the base spell's effect, it is itself not a spell. The only spell cast is that base spell. So no, storm only gets to see that one spell, even if you splice several cards onto it.
No. Splicing on to a card just adds that card's text to the arcane spell. It does not count as casting another spell. Casting Glacial Ray and splicing on the Ritual means you're still just casting one spell, not two spells.
Private Mod Note
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DCI Level 2 Judge
Scientists have calculated that the chance of anything so patently absurd actually existing are millions to one. But magicians have calculated that million-to-one chances crop up nine times out of ten.
If I cast an Arcane spell, and splice onto it with Desperate Ritual, then later that turn cast Grapeshot, does it Storm one time, or two?
I'm thinking one, but am hoping two.
Former Rules Advisor
"Everything's better with pirates." - Lodge
(The Gamers: Dorkness Rising)
"Any sufficiently analyzed magic is indistinguishable from science."
(Girl Genius - Fairy Tale Theater Break - Cinderella, end of volume 8)
Scientists have calculated that the chance of anything so patently absurd actually existing are millions to one. But magicians have calculated that million-to-one chances crop up nine times out of ten.