SHSP World Premieres: Archfiend Giant and Sininster Yorishiro, also, will Mistake be Secret Rare?

Two more World Premieres were revealed on Konami's blog today! Take a look:

Archfiend Giant

Dark / 6 / Fiend / 2400 / 1600

If this face-up card on the field would be destroyed by a card effect, you can pay 500 Life Points instead. This effect can only be used once while this card is face-up on the field. If this card is destroyed by a card effect and sent to the Graveyard: You can Special Summon 1 "Archfiend" monster from your hand.

Sinister Yorishiro

Continuous Trap

Each turn, 1 Level 5 or higher Fiend-Type monster you Normal Summon can be Summoned without Tributing. If exactly 1 Normal Summoned/Set Level 5 or higher Fiend-Type Monster (and no other cards) would be destroyed: You can send this card to the Graveyard instead.

I don't play Archfiends, but to me these cards look pretty decent. Protection on a big monster is almost always great, and Yorishiro plays two very different, useful roles in a single card. Best of all, they don't appear to be broken! Bravo, Konami! I will say though that it's a bit ironic that Fiends got this card while everybody is trying to figure out how to make Vampires work with so many Level 5 monsters, lol.

This brings the total of fully known World Premieres from this set to 6 - we have Ghostrick Ghoul, Vampire Duke, Lady of the Lake, Noble Knight Borz, and the two new cards from today. There are still three more Noble Knight cards to be revealed, meaning that only one card is 100% unknown at this point.

The next bit of news we have is Mistake, whose article was actually dated for last Friday but wasn't uploaded until just earlier today (the 21st). Mistake has been hotly anticipated as an additional Side Deck answer to Dragon Rulers and anything else capable of doing a lot of searching (which is basically any meta deck period), but from the image in its preview article it seems that it will be released as a Secret Rare. I'm actually pretty surprised and obviously very disappointed by this news, but it isn't exactly set in stone yet.

 
From looking at the picture, what do you guys think? Believe it or not, there are slight differences in gray name text on official proxies that can reveal if a card will either be Rare or Secret (usually, darker gray indicates Secret status). I know that a lot of us are hopeful and will probably be biased by that hope into thinking that it looks Rare, but I'm still interested to hear your thoughts down below in the comments. I'll be back later in the week with more preview coverage! Thanks for reading.