Any other exotic mana symbols and scenarios (such as cards with more than one printed cost) have their mana value calculated according to specific rules
Still, there are a few guiding principles to Anhelos deck design which we can observe from the precon: Use casualty to fuel itself with token generators: The synergies in this deck will naturally push us to play as many instants and sorceries as possible, but you ideally also need enough creature fodder to pay for casualty every turn
Red Suns Twilight Mileage on Red Sun's Twilight will vary, but its Vandalblast levels of artifact removal
As an example, Emchompite says that cards that were included within Japanese sets, like the Secret Rare Yveltal EX from Best of XY, but as promos in English, are usually more expensive in Japanese just due to the nature of their release (i.e., having to pull the card from a pack vs a guaranteed promo card in a product)
That's why we're bringing them back with four Scene Boxes
Abilities that trigger whenever a creature attacks won't trigger when it enters attacking