It's fairly typical of Black creatures, like Vampire, to be able to sacrifice another creature to gain a boost either temporary, like Bloodthrone Vampire , or permanent, like Bloodflow Connoisseur
Grief you can get going on your first turn, putting your opponent to just five cards in their opening hand, and you start with a 3/2 creature with menace
711.2b While a double-faced permanent's back face is up, it has only the characteristics of its back face
Hes really good at holding equipment such as Sword of Hearth and Home or Umezawas Jitte to get extra triggers when he deals damage, but you can also use him to tutor up Skullclamp in your tokens deck and then immediately equip it to him to draw four cards when he dies
You'll also want to have the Magic: The Gathering Companion app downloaded onto your phone before you go
I guess thats the other deck