Otarian Juggernaut 
Artifact Creature — Juggernaut
This creature can't be blocked by Walls.
Threshold — As long as there are seven or more cards in your graveyard, this creature gets +3/+0 and attacks each combat if able.
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Cards that do something similar expected a card that isn't here?
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Wall of Shadows 89%
$0.16#21541
"This creature can't be the target of spells that can target only Walls or of abilities that can target only Walls."