Braids, Arisen Nightmare Braids, Arisen Nightmare is probably better-known as a card draw engine in the 99 of sacrifice-focused decks, but she is also a great Commander
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Royal Straight X SPELL Quick-Play Send 1 "Queen's Knight", "King's Knight", and "Jack's Knight" from your hand and/or face-up Monster Zone to the GY, then Special Summon 1 monster from your hand, Deck, Extra Deck, or GY that mentions all of "Queen's Knight", "King's Knight", and "Jack's Knight"
As you see in the article linked above, the design team, including myself, was a bit skeptical at firstwe tend not to make new card types very oftenbut Matt stayed strong and managed to convince us why we needed to do it
One of the coolest things about Kaladesh from a design standpoint is that none of the named mechanics featured in the set are recycled from any previous expansion
Let's just say that the writers' room wasn't surprised when he called it