Dolmen Gate 
Artifact
Prevent all combat damage that would be dealt to attacking creatures you control.
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Cards that do something similar expected a card that isn't here?
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Goldbug, Humanity's Ally // Goldbug, Scrappy Scout 90%
$1.42#11582
"Prevent all combat damage that would be dealt to attacking Humans you control."
Harmless Assault 90%
$0.11#24924
"Prevent all combat damage that would be dealt this turn by attacking creatures."
Losheel, Clockwork Scholar 88%
$2.69#1544
"Prevent all combat damage that would be dealt to attacking artifact creatures you control."
Mark of Asylum 88%
$1.52#16376
"Prevent all noncombat damage that would be dealt to creatures you control."
Iroas, God of Victory 87%
$12.79#1467
"Prevent all damage that would be dealt to attacking creatures you control."
Tajic, Legion's Edge 85%
$0.50#7741
"Prevent all noncombat damage that would be dealt to other creatures you control."
Crystal Barricade 85%
$1.52#2103
"Prevent all noncombat damage that would be dealt to other creatures you control."
Blessed Sanctuary 84%
$4.39#5853
"Prevent all noncombat damage that would be dealt to you and creatures you control."
Druid's Deliverance 84%
$0.33#4041
"Prevent all combat damage that would be dealt to you this turn. Populate."
Inkshield 83%
$4.21#807
"Prevent all combat damage that would be dealt to you this turn. For each 1 damage prevented this way, create a 2/1 white and black Inkling creature token with flying."
Snag 82%
$0.28#17922
"Prevent all combat damage that would be dealt by unblocked creatures this turn."
Commencement of Festivities 81%
$0.18#14574
"Prevent all combat damage that would be dealt to players this turn."
Defend the Hearth 81%
$0.07#14602
"Prevent all combat damage that would be dealt to players this turn."
Seraph of the Sword 81%
$0.38#17660
"Prevent all combat damage that would be dealt to this creature."