Banned and Restricted Update, July 2 2018
Other formats remain unchanged.
The popularity of Deathrite Shaman decks has been a topic of discussion in the Legacy community for much of the past year. During that time period, Grixis Delver decks using Deathrite Shaman have been the most played deck on Magic Online, with other Deathrite Shaman variants among the next most popular decks. In recent snapshots of the environment, Grixis Delver showed a 55% (non-mirror-match) win rate against the field. At Grand Prix Birmingham, eleven of the top sixteen decks used four copies of Deathrite Shaman, including five of the Top 8. (...) While a card seeing lots of competitive play doesn't by itself necessitate action, in this case we also see a reduction in diversity in the environment, an inability for the metagame to adjust, and a dominant strategy that's particularly hostile to rogue decks and innovation. For these reasons, Deathrite Shaman is banned in Legacy.
Gitaxian Probe is a subtle but powerful card that has previously been banned in Modern and restricted in Vintage. It's been a main component of the success of the two most played Legacy decks on Magic Online, Grixis Delver and Ad Nauseam Tendrils. Gitaxian Probe adds significant power to these decks and others by quickly filling the graveyard and counting toward abilities that require casting spells or drawing cards, without requiring mana investment. (...) While Gitaxian Probe's impact on the Legacy environment hasn't necessarily reached a boiling point, it is a strong contributor to the success of many of the most popular decks. Because of the negative influence Gitaxian Probe has on gameplay as a free spell and low-cost information advantage, we prefer to remove it from the format rather than needing to weaken the strategies it facilitates in other ways. We've seen Modern end up in a healthier place without Gitaxian Probe, and it's time to take that step for Legacy.
Based on this, what do you think will show up on the top of the interests tomorrow?
For the full explanation, refer to the official announcement by WotC.