Walking Skyscraper 
Artifact Creature — Construct
This spell costs {1} less to cast for each modified creature you control. (Equipment, Auras you control, and counters are modifications.)
Trample
This creature has hexproof as long as it's untapped. (It can't be the target of spells or abilities your opponents control.)
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Cards that do something similar expected a card that isn't here?
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Illusion Spinners 100%
$0.11#19811
"This creature has hexproof as long as it's untapped."
+1 more matching line
Stoic Sphinx 86%
$0.17#21153
"This creature has hexproof as long as you haven't cast a spell this turn."
Veteran Bodyguard 85%
#27361
"As long as this creature is untapped, all damage that would be dealt to you by unblocked creatures is dealt to this creature instead."
Martyrs of Korlis 82%
#31382
"As long as this creature is untapped, all damage that would be dealt to you by artifacts is dealt to this creature instead."
Spectral Denial 81%
$0.34#8388
"This spell costs {1} less to cast for each creature you control with power 4 or greater."