原文Chandra's second ability checks the characteristics of the card you exiled to see if it's red. If the spell that card becomes somehow isn't red, you may still cast it. For example, Rowan, Scholar of Sparks, the front face of a modal double-faced card, is red. Will, Scholar of Frost, the back face of the same card, is blue. In exile, that card is red, so you may cast either face if you exile it with this ability.
原文Chandra's last ability, by contrast, only allows you to cast spells that are red when you cast them, no matter what the card in exile is. If Rowan, Scholar of Sparks is exiled by this ability, you won't be able to cast Will, Scholar of Frost this way because it would be a blue spell.
原文The emblem's triggered ability looks for the actual amount of mana spent to cast the spell. If an effect caused you to pay more or less mana for that spell as you cast it, that will be taken into account when determining the value of X. If an effect would counter that spell unless you pay some amount of mana, that mana doesn't count as mana spent to cast it.
訳文紋章の誘発型能力は、呪文を唱えるために実際に費やされたマナの量を参照します。効果によって、その呪文を唱える際に支払うマナの量が増えたり減ったりした場合、それは X の値を決定する際に考慮されます。効果によって、ある量のマナを支払わなければその呪文を打ち消す場合、そのマナは呪文を唱えるために費やされたマナとしてはカウントされません。