Everdream

You reveal all cards you intend to splice at the same time. Each individual card can be spliced only once onto any one spell, although multiple cards with the same name may be spliced onto one spell.

If a spell is copied, choices made while casting it are copied, so the copy will have the same abilities spliced onto it as the original.

The legality of a spell’s targets is checked only as that spell begins to resolve. If the spell this card is spliced onto causes its targets to become illegal while it’s resolving (for example, by removing them from the battlefield), you’ll still draw a card.