Goblin Locksmith 

Creature — Goblin Rogue
Whenever this creature attacks, creatures with defender can't block this turn.
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Cards that do something similar expected a card that isn't here?
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Plasma Jockey 95%
$0.12#21759
"Whenever this creature attacks, target creature an opponent controls can't block this turn."
Clamor Shaman 95%
$0.13#19472
"Whenever this creature attacks, target creature an opponent controls can't block this turn."
Gilded Cerodon 95%
$0.04#27831
"Whenever this creature attacks, if you control a Desert or there is a Desert card in your graveyard, target creature can't block this turn."
Radha's Firebrand 95%
$0.18#21319
"Whenever this creature attacks, target creature defending player controls with power less than this creature's power can't block this turn."
Grotag Thrasher 91%
$0.11#27970
"Whenever this creature attacks, target creature can't block this turn."
Goblin Heelcutter 91%
$0.08#20211
"Whenever this creature attacks, target creature can't block this turn."
Mardu Roughrider 91%
$0.10#24229
"Whenever this creature attacks, target creature can't block this turn."
Goma Fada Vanguard 89%
$0.09#15871
"Whenever this creature attacks, target creature an opponent controls with power less than or equal to the number of Warriors you control can't block this turn."
Crashing Boars 89%
#29408
"Whenever this creature attacks, defending player chooses an untapped creature they control. That creature blocks this creature this turn if able."
Maulfist Doorbuster 87%
$0.10#25757
"Whenever this creature attacks, you may pay {E}. If you do, target creature can't block this turn."
Forgehammer Centurion 85%
$0.09#21835
"Whenever this creature attacks, you may remove two oil counters from it. When you do, target creature can't block this turn."
Spider-Man, Web-Spinner 84%
$23.90#23672
"Whenever this card attacks, target creature can't block this turn."
Impetuous Devils 82%
$0.27#15995
"When this creature attacks, up to one target creature defending player controls blocks it this combat if able."