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In the Commander variant, a double-faced card's color identity is determined by the mana costs and mana symbols in the rules text of both faces combined. If either face has a color indicator or basic land type, those are also considered.

The mana value of a modal double-faced card is based on the characteristics of the face that's being considered. On the stack or the battlefield, consider whichever face is up. In all other zones, consider only the front face. This is different than how the mana value of other double-faced cards is determined.

Each double-faced card has an icon in the top-left corner of each face. For modal double-faced cards in this set, these icons are a single black triangle for the front face, and a double white triangle for the back face.

If an effect instructs a player to choose a card name, the name of either face may be chosen. If that effect or a linked ability refers to a spell with the chosen name being cast and/or a land with the chosen name being played, it considers only the chosen name, not the other face's name.

Ghost-Spider's triggered ability will trigger even if the spell you cast isn't represented by a card. For example, if an effect copies a card in exile and allows you to cast the copy, casting that copy will cause Ghost-Spider's triggered ability to trigger.

If an effect allows you to put a card with particular characteristics onto the battlefield without instructing you to play or cast it, you consider only the characteristics of a modal double-faced card's front face to see if that card qualifies. If it does, it enters the battlefield with its front face up.