Branded Howler

Creature - Werewolf

(Color indicator: Branded Howler is red)

At the beginning of each upkeep, if a player cast two or more spells last turn, transform Branded Howler.

It is said that one of the most notorious werewolf howlpacks, the Vildin, only calls those whose hands are already stained with blood.

4/4

Card has other part: Convicted Killer

2016-04-08 The abilities that transform a Werewolf back and forth look at the entire previous turn, even if the Werewolf with that ability wasn't on the battlefield for some or all of that turn.
2016-04-08 To trigger the Werewolf's back face's transform ability, a single player must have cast two or more spells during the previous turn. If multiple players each cast just one spell during the previous turn, the ability won't trigger.
2016-07-13 For more information on double-faced cards, see the Shadows over Innistrad mechanics article (http://magic.wizards.com/en/articles/archive/feature/shadows-over-innistrad-mechanics).

Card is in preconstructed decks:

mtg.wtf