Wizards of the Coast updated its Magic: The Gathering Banned and Restricted Lists today, banning Oko, Thief of Crowns and Once Upon a Time, featured cards from Throne of Eldraine, in Standard format, a little over a month after the set was released (see "Wizards of the Coast Unveils 'Throne of Eldraine' Product Line").  Both were marquee cards in the new set and highly sought-after by players and collectors alike. With the Standard bans, their utility for competitive play has been diminished, which may take a toll on the rest of Throne of Eldraine's sealed product and singles sales cycle. Oko,Thief of Crowns is a Mythic rare worth around $25.00 to $30.00 on the secondary market as this announcement is made, according to TCGPlayer.

Here's the full banned list for the four tournament format:

• Standard format. Oko, Thief of Crowns, Once Upon a Time, and Veil of Summer are all banned.
• Brawl format. Oko, Thief of Crowns is banned.
• Legacy format. Wrenn and Six is banned.
• Vintage format. Narset, Parter of Veils is restricted.

This was just one of several gaffes in Magic card design this year, leading to the banning of Hogaak in Modern during the summer (see "Wizards of the Coast Updates 'Magic: The Gathering' Banned and Restricted Lists "), and to the more recent banning of Field of the Dead in Standard (see "'Magic: The Gathering' Ban Hammer Comes Down On 'Field of the Dead'").