Oracle

Enchantment - Aura 

Enchant creature
Enchanted creature gets +2/+2 and is goaded. (It attacks each combat if able and attacks a player other than you if able.)
Whenever enchanted creature attacks, its controller loses 2 life and you gain 2 life.

Tournooi-info

Legal in: Vintage, Legacy, Commander

Officiele rulings

2020-04-17 - wotc
Parasitic Impetus causes you to gain life, not the attacking creature's controller.

2020-04-17 - wotc
If you are the attacking creature's controller, you lose 2 life and gain 2 life. You won't lose the game if your life total is 0 in between these two events.

2020-04-17 - wotc
If a goaded creature can't attack for any reason (such as being tapped or having come under that player's control that turn), then it doesn't attack. If there's a cost associated with having it attack, its controller isn't forced to pay that cost, so it doesn't have to attack in that case either.

2020-04-17 - wotc
If a goaded creature doesn't meet any of the above exceptions and can attack, it must attack a player other than a player who goaded it if able. It the creature can't attack any of those players but could otherwise attack, it must attack an opposing planeswalker (controlled by any opponent) or a player who goaded it.

2020-04-17 - wotc
Attacking with a goaded creature doesn't cause it to stop being goaded.

2020-04-17 - wotc
Being goaded more than once by the same player is redundant.

2020-04-17 - wotc
If you goad a creature you control, it must attack and it must attack a player rather than a planeswalker.

2020-04-17 - wotc
If a creature you control has been goaded by multiple opponents, it must attack one of your opponents who hasn't goaded it. If a creature you control has been goaded by each of your opponents, you choose which opponent it attacks.

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