No. Lifeline doesn't target anything, since it does not use the word 'target'. It has no interaction with Willbreaker.
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DCI Level 2 Judge
Scientists have calculated that the chance of anything so patently absurd actually existing are millions to one. But magicians have calculated that million-to-one chances crop up nine times out of ten.
115. Targets
115.1d A triggered ability is targeted if it identifies something it will affect by using the phrase “target [something],” (...)
115.10. Spells and abilities can affect objects and players they don’t target. In general, those objects and players aren’t chosen until the spell or ability resolves. See rule 608, “Resolving Spells and Abilities.”
115.10a Just because an object or player is being affected by a spell or ability doesn’t make that object or player a target of that spell or ability. Unless that object or player is identified by the word “target” in the text of that spell or ability, or the rule for that keyword ability, it’s not a target.
115.10b In particular, the word “you” in an object’s text doesn’t indicate a target.
115.10a Just because an object or player is being affected by a spell or ability doesn’t make that object or player a target of that spell or ability. Unless that object or player is identified by the word “target” in the text of that spell or ability, or the rule for that keyword ability, it’s not a target.
115.10b In particular, the word “you” in an object’s text doesn’t indicate a target.
Lifeline's Oracle text:
Whenever a creature dies, if another creature is on the battlefield, return the first card to the battlefield under its owner's control at the beginning of the next end step.
No "target" there, therefore Lifeline doesn't target.
If I have both in play do I gain control of every creature that dies and gets brought back into play with lifeline?
Or does lifeline not target and thus they don't interact at all?
Scientists have calculated that the chance of anything so patently absurd actually existing are millions to one. But magicians have calculated that million-to-one chances crop up nine times out of ten.
115.1d A triggered ability is targeted if it identifies something it will affect by using the phrase “target [something],” (...)
115.10. Spells and abilities can affect objects and players they don’t target. In general, those objects and players aren’t chosen until the spell or ability resolves. See rule 608, “Resolving Spells and Abilities.”
115.10a Just because an object or player is being affected by a spell or ability doesn’t make that object or player a target of that spell or ability. Unless that object or player is identified by the word “target” in the text of that spell or ability, or the rule for that keyword ability, it’s not a target.
115.10b In particular, the word “you” in an object’s text doesn’t indicate a target.
RULES OF MAGIC :
http://magic.wizards.com/en/game-info/gameplay/rules-and-formats/rules
Lifeline's Oracle text:
No "target" there, therefore Lifeline doesn't target.
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