Reweave

five generic mana one blue mana Instant — Arcane

Target permanent's controller sacrifices it. If the player does, they reveal cards from the top of their library until they reveal a permanent card that shares a card type with the sacrificed permanent, put that card onto the battlefield, then shuffle.

Splice onto Arcane two generic mana one blue mana (As you cast an Arcane spell, you may reveal this card from your hand and pay its splice cost. If you do, add this card's effects to that spell.)

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Reweave rulings

2013-06-07
You reveal all cards you intend to splice at the same time. Each individual card can be spliced only once onto any one spell.
2013-06-07
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.
2013-06-07
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.
2013-06-07
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.
2008-04-01
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.
2005-11-01
The player reveals cards only if the targeted permanent gets sacrificed.
2005-04-01
When Reweave resolves it uses the type(s) that the permanent had right before it was sacrificed.

Reweave keyword rules

Splice Rule 702.47

Splice is a static ability that functions while a card is in your hand. “Splice onto [quality] [cost]” means “You may reveal this card from your hand as you cast a [quality] spell. If you do, that spell gains the text of this card’s rules text and you pay [cost] as an additional cost to cast that spell.” Paying a card’s splice cost follows the rules for paying additional costs in rules and –h.

You can’t choose to use a splice ability if you can’t make the required choices (targets, etc.) for that card’s rules text. You can’t splice any one card onto the same spell more than once. If you’re splicing more than one card onto a spell, reveal them all at once and choose the order in which their effects will happen. The effects of the main spell must happen first.

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 , “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.

Choose targets for the added text normally (see rule ). Note that a spell with one or more targets won’t resolve if all of its targets are illegal on resolution.

The spell loses any splice changes once it leaves the stack for any reason.