Evermind

• WWizards of the Coast2005-06-01
  Official Ruling
  Evermind is a blue Arcane instant card. Cards that check whether a card has any of those attributes will affect Evermind. For example, you can exile it (as a blue card) to pay the alternative costs of spells like Force of Will and Disrupting Shoal (X = 0). You could search for it with Mystical Tutor because it's an instant or Eerie Procession because it's an Arcane spell.
• WWizards of the Coast2005-06-01
  Official Ruling
  Evermind is blue in all zones.
• WWizards of the Coast2006-10-15
  Official Ruling
  Evermind has no mana cost, which means it can't normally be cast as a spell. You could, however, cast it via some alternate means, like with Sunforger or Kaho, Minamo Historian.
• WWizards of the Coast2006-10-15
  Official Ruling
  If a spell or effect, such as Parallectric Feedback, asks for Evermind's mana value, it's 0.
• WWizards of the Coast2013-06-07
  Official Ruling
  You reveal all cards you intend to splice at the same time. Each individual card can be spliced only once onto any one spell.
• WWizards of the Coast2013-06-07
  Official Ruling
  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.
• WWizards of the Coast2013-06-07
  Official Ruling
  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.
• WWizards of the Coast2013-06-07
  Official Ruling
  Although originally printed with a characteristic-defining ability that defined its color, this card now has a color indicator. This color indicator can't be affected by text-changing effects (such as the one created by Crystal Spray), although color-changing effects can still overwrite it.
• WWizards of the Coast2013-06-07
  Official Ruling
  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.
• WWizards of the Coast2024-02-02
  Official Ruling
  A card with no mana cost can't be cast normally; you'll need a way to cast it for an alternative cost or without paying its mana cost, such as by suspending it.
• WWizards of the Coast2024-02-02
  Official Ruling
  If a card with no mana cost is given an alternative cost equal to its mana cost (by Snapcaster Mage, for example), that cost cannot be paid and the card cannot be cast this way.

Rulings via Scryfall