Splicer's Skill

If all of the spell’s targets are illegal when the spell tries to resolve, it won’t resolve and none of its effects will happen, including those from cards spliced onto it.

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 create a Golem.