Beelzebot

At the beginning of each player's upkeep, that player
reveals the top card of their library, loses life equal to its converted mana cost, then puts that card into their
hand.
Whenever a player loses more than 5 life, untap
Beelzebot. It gains indestructible until end of turn.
"Well it so happens that I'm in the mood to make a deal with
you."