Make no mistake, this isnt big Grizz, but the ability here is tempting enough that many players are going to attempt to make it viable
1 Thalia, Guardian of Thraben At just two mana for a 2/1 with first strike and the ability to slow down your opponents by making all their noncreature spells cost one more mana, Thalia, Guardian of Thraben is one of the most cost-effective ways to tax your opponents in any format
This proves that the person who possesses this card participated in the Secret Super Battle Best in Japan Deciding Match. Thanks, Bulbapedia
The turtle has Metalcraft, which means you can tap your artifacts to help pay for its mana cost - such as the flurry of free artifacts and Drones you generated on turn one
The other alternative is that this spike is driven more by hype around the rules change than actual demand
Even we are of course also very fan of the zards that makes writing these blogs extra fun