It took almost 5 months of speculation (after is was not shown to be in Modern Masters), but Thoughtseize is finally returning to standard with Theros. Thoughtseize has a been a card that was good ever since it was introduced in Lorwyn, and throughout the years, has stayed fairly valuable. As you can see below, the card started gaining more value at the beginning of the year and reached the $70 range.
With the spoiling of the card, it has dropped to half the value immediately with Star City before jumping up to its current price of $40. Unlike Modern Masters, the printing of this card in Theros will keep it from jumping back to the $70 range for quite some time. Theros is looking to be a really solid set, so we will be keeping an eye on this card and it’s foil version over the next few months to see how it performs. The image below gives you a better idea of recent performance.
If you are looking to buy copies of Thoughseize, and don’t want to wait for Theros, this would be a good time as people will be unloading their copies as the price falls and you should be able to find a good deal on places such as eBay.