Six of the cards in the set introduced a new type of hybrid mana, what we in R&D call "twobrid." Twobrid mana allows you to pay either one mana of a particular color or two mana of any color and/or colorless
There is quite some variance in the weight of cards and people spent a lof of effort to map weights of certain cards, but it is mostly in the second number after the comma
#3 Porom's Silence Magic (Silence - Rainbow Foil) Turns are a lot less stressful, especially in the end game, when you dont have to worry about your opponents doing something that throws a wrench in your well-laid plans, and thats why Silence is almost a must-have in decks running white
JPN cards are generally well-centered, but check anyway Inspect corners Use a loupe or magnifying glass
Its incredibly soft to enchantment removal, so playing this card is a huge gamble
So, hes number 9, Thassa is number 10