1 Apr 2005
When Reweave resolves it uses the type(s) that the permanent had right before it was sacrificed.
1 Nov 2005
The player reveals cards only if the targeted permanent gets sacrificed.
1 Apr 2008
With the introduction of the kindred type it became possible for an instant or sorcery card to share a type with the sacrificed permanent (ie, a kindred instant card shares a type with a kindred enchantment card). Reweave has received errata so that the effect looks for a *permanent* card that shares a type with the sacrificed permanent. A permanent card is a card that could be put onto the battlefield, which is any card that isn't an instant or sorcery.
7 Jun 2013
You reveal all cards you intend to splice at the same time. Each individual card can be spliced only once onto any one spell.
7 Jun 2013
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.
7 Jun 2013
A card with a splice ability can't be spliced onto itself because the spell is on the stack (and not in your hand) when you reveal the cards you want to splice onto it.
7 Jun 2013
You choose all targets for the spell after revealing cards you want to splice, including any targets required by the text of any of those cards. You may choose a different target for each instance of the word "target" on the resulting spell.