Through the Breach #404
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Card Details
You may put a creature card from your hand onto the battlefield. That creature gains haste. Sacrifice that creature at the beginning of the next end step.
Splice onto Arcane 
Illustrated by Randy Vargas
Rulings (5)
May 1, 2007
Putting the card onto the battlefield is optional. When the ability resolves, you can choose not to.
Jun 7, 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.
Jun 7, 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.
Jun 7, 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.
Jun 7, 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.
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