Text (SK+errata): ~this~ is blue. ; (Nonexistent mana costs can't be paid.) ; Draw a card. ; Splice onto Arcane {1}{U}. [Oracle 2007/05/01]
This card is blue in all zones. See Rule 604.3. [D'Angelo 2007/06/04]
The only way to play this card is by splicing it. [D'Angelo 2005/12/01] Another way is using Isochron Scepter. [D'Angelo 2006/11/11]
It can be played if an effect allows you to play a spell without paying its cost. See Rule 116.9. For example with Mind's Desire. [D'Angelo 2007/10/20]
Note - Also see Instant Type for Arcane, Rule 304.3.