Parasitic Impetus 

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.
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Cards that do something similar expected a card that isn't here?
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Psychic Impetus 100%
$0.13#7035
"Enchanted creature gets +2/+2 and is goaded."
+1 more matching line
Acquired Mutation 100%
$0.32#9754
"Enchanted creature gets +2/+2 and is goaded."
+1 more matching line
Coercive Impetus 87%
$0.33#8401
"Enchanted creature gets +1/+1 and is goaded."
+1 more matching line
Brutal Hordechief 85%
$2.67#6618
"Whenever a creature you control attacks, defending player loses 1 life and you gain 1 life."
Campaign of Vengeance 85%
$0.40#12164
"Whenever a creature you control attacks, defending player loses 1 life and you gain 1 life."
MacCready, Lamplight Mayor 85%
$6.58#3650
"Whenever a creature with power 4 or greater attacks you, its controller loses 2 life and you gain 2 life."
Reaper's Talisman 83%
$0.12#13011
"Whenever equipped creature attacks alone, defending player loses 2 life and you gain 2 life."
Whiplash, Vengeful Engineer 82%
$0.14#22535
"Whenever this card attacks, if he's equipped, each opponent loses X life and you gain X life, where X is the number of Equipment attached to him."
Revenge of Ravens 82%
$0.48#2802
"Whenever a creature attacks you or a planeswalker you control, that creature's controller loses 1 life and you gain 1 life."
Ragged Recluse // Odious Witch 81%
$0.17#25285
"Whenever this creature attacks, defending player loses 1 life and you gain 1 life."
Agate-Blade Assassin 81%
$0.18#8468
"Whenever this creature attacks, defending player loses 1 life and you gain 1 life."
Knights' Charge 81%
$0.89#6118
"Whenever a Knight you control attacks, each opponent loses 1 life and you gain 1 life."
Valley Rotcaller 80%
$3.33#2294
"Whenever this creature attacks, each opponent loses X life and you gain X life, where X is the number of other Squirrels, Bats, Lizards, and Rats you control."
Sanguine Syphoner 80%
$0.21#6608
"Whenever this creature attacks, each opponent loses 1 life and you gain 1 life."
Postmortem Professor 80%
$0.24#17114
"Whenever this creature attacks, each opponent loses 1 life and you gain 1 life."
Hooded Blightfang 80%
$0.80#6647
"Whenever a creature you control with deathtouch attacks, each opponent loses 1 life and you gain 1 life."