Through the Breach

Instant - Arcane, 4R (5)
You may put a creature card from your hand onto the battlefield. That creature has haste. Sacrifice that creature at the beginning of the next end step.

Splice onto Arcane {2}{R}{R} (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.)¹
Illus. Hugh Jamieson

Gatherer Card Rulings [Nov 2009]

• 5/1/2007: Putting the card onto the battlefield is optional.  When the ability resolves, you can choose not to.

Format Legality	Legal in Vintage, Legacy, Extended, MTGO Classic Banned in Standard
Printings (1/8)	Champions of Kamigawa (Rare)