Blood Tokens
111.4

According to this rule, if a spell or ability created a token without specifying its name, the token's name was the same as its subtypes. For example, an effect which says "create a 2/2 Illusion creature token" would create a token whose name was Illusion. This had some uncommon but weird interactions with effects that let you choose the name of a card, such as those of Pithing Needle and Runed Halo. Since you can only choose names of printed cards for such effects, you usually can't choose the name of a token. Sometimes, however, the name of an unrelated card happens to overlap with the name of a token, such as the Illusion half of the split card Illusion / Reality. In that case, choosing the name of the card would apply any relevant effects to tokens named Illusion.

With the creation of Blood tokens in Innistrad: Crimson Vow, this relatively obscure interaction had the potential to become significantly more common (see Flesh / Blood). The fact that a player could stop Blood tokens with Pithing Needle's effect but not Treasure, Food, or Clue tokens is inconsistent, and players shouldn't be expected to know which tokens share a name with a printed card, so we decided to change the rule. From now on, if a spell or ability is creating a token without specifying its name, the name will be the same as its subtypes plus the word "Token." For example, a "Goblin Scout creature token" is named "Goblin Scout Token." Similarly, the name of a Blood token created in the game is "Blood Token" and choosing the name "Blood" for an effect will not cause that effect to apply to Blood tokens.

Note that Blood token supplements found in Innistrad: Crimson Vow boosters will only have the word Blood on the name line. This does not affect gameplay. Also keep in mind that this rule change does not apply to a token that is a copy of another permanent or was created due to an ability that specified its name, such as that of Llanowar Mentor.