One of my major goals in any spoiler analysis is to figure out the approximate speed of the format. There are a lot of tools that I use to do this because any one tool doesn’t perfectly model the format’s speed. However, none of those tools are quite as useful as the creature P/T differential. Over the past couple of years it has been the most reliable method for predicting the speed of the format. P/T Differential represents the difference between the power and the toughness of the creatures in the set. Toughness is usually larger than power, so numbers that are between -0.1 and .1 tend to be the fastest formats. Formats with a differential between -0.3 and -0.1 tend to be medium speed formats, and formats with larger negative differentials tend to be slow. There are many other factors, and Theros wound up being the biggest exception for this rule, but it’s still a great indicator for format speed.
For Khans of Tarkir, it’s hard to pinpoint the P/T differential precisely. When you put a huge number of 2/2s for 3 in the set, you’re going to drive your P/t differential closer to zero. Even then, Khans of Tarkir has one of the slowest P/T differentials that we’ve seen in a long time. Using the Morph model, we see a fairly slow format, but the other models show the greatest negative P/T differential of any format that I’ve analyzed on Ars Arcanum. There are a lot of creatures that block well in this format; there are a surprising amount of 2/3s for 3, there’s a 4 or greater toughness theme, and there seems to be a lot of defenders. It seems like WotC tried to put in tool to slow down the format in order to make it more feasible to play three color decks.
These charts also show us the huge difference that Morph makes on the format. In the first chart, we see a definite glut of creatures at 2 power and 2 toughness. It seems clear that the difference between two and three toughness is going to be tremendous in this set. It means the difference between trading and eating the vast majority of creatures in the set before turn five. Debilitating Injury is significantly better than it looks because it eats a morph that could turn up to become something scary later on.
In the other two charts, we see a little bit different picture. While the early game is going to be dominated by 2/2s, the mid and late games are going to see a lot of creatures come down with three, four, and five toughness. Even with morph creatures counted as only being played faceup, we still see that two is the most common power, though three becomes the most common toughness. These creatures are geared up for defense, and it’s going to be difficult to build a large number of decks that can consistently punch through for 20 damage before the more controlling decks can set up their game plan.
It’s also worth mentioning that this set has a very low return on power compared with the converted mana cost investment, and this is due almost entirely to morph. Three mana for a 2/2 is not an exciting price in today’s limited world, so we are not used to seeing such a low average power per creature relative to the mana costs. Khans of Tarkir is going to be something of a shock to players that started playing Magic in the years since Zendikar.