Rule 702.46c

The spell has the characteristics of the main spell, plus the rules text of each of the spliced cards. This is a text-changing effect (see rule 612, “Text-Changing Effects”). The spell doesn’t gain any other characteristics (name, mana cost, color, supertypes, card types, subtypes, etc.) of the spliced cards. Text gained by the spell that refers to a card by name refers to the spell on the stack, not the card from which the text was copied. Example: Glacial Ray is a red card with splice onto Arcane that reads, “Glacial Ray deals 2 damage to any target.” Suppose Glacial Ray is spliced onto Reach Through Mists, a blue spell. The spell is still blue, and Reach Through Mists deals the damage. This means that the ability can target a creature with protection from red and deal 2 damage to that creature.

Find this number in the current Rules