Rulings
Devour Flesh targets only a player. It doesn’t target any creatures. The target player chooses which creature to sacrifice when the spell resolves. That player can sacrifice only a creature they control.
(wotc • 2013-01-24)
The amount of life gained is equal to the creature’s toughness as it last existed on the battlefield.
(wotc • 2013-01-24)
Rulings
Devour Flesh targets only a player. It doesn’t target any creatures. The target player chooses which creature to sacrifice when the spell resolves. That player can sacrifice only a creature they control.
(wotc • 2013-01-24)
The amount of life gained is equal to the creature’s toughness as it last existed on the battlefield.
(wotc • 2013-01-24)