Gloom Stalker 

Creature — Dwarf Ranger
As long as you've completed a dungeon, this creature has double strike.
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Cards that do something similar expected a card that isn't here?
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Omenport Vigilante 86%
$0.13#24586
"This creature has double strike as long as you've committed a crime this turn."
Momentum Rumbler 84%
$0.26#21905
"Whenever this creature attacks, if it has first strike, it gains double strike until end of turn."
Rakdos Pit Dragon 84%
$0.14#23708
"This creature has double strike as long as you have no cards in hand."
Silverblade Paladin 84%
$0.77#9674
"As long as this creature is paired with another creature, both creatures have double strike."
Picnic Ruiner // Stolen Goodies 83%
$0.15#14988
"Whenever this creature attacks while you control a creature with power 4 or greater, this creature gains double strike until end of turn."