Tromokratis {5}{U}{U}
Legendary Creature — Kraken
Tromokratis has hexproof unless it's attacking or blocking.
Tromokratis can't be blocked unless all creatures defending player controls block it. (If any creature that player controls doesn't block this creature, it can't be blocked.)
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Cards that do something similar expected a card that isn't here?
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Mogg Toady 85%
$0.11#30572
"This creature can't block unless you control more creatures than attacking player."
Goblin Goon 85%
$0.35#20282
"This creature can't block unless you control more creatures than attacking player."
Satyr's Cunning 83%
$0.26#18198
"Create a 1/1 red Satyr creature token with "This token can't block.""
Illusionist's Gambit 83%
$0.44#3736
"Cast this spell only during the declare blockers step on an opponent's turn."
Silumgar Assassin 83%
$0.31#10647
"Creatures with power greater than this creature's power can't block it."
Elusive Otter // Grove's Bounty 82%
$0.29#7001
"Creatures with power less than this creature's power can't block it."
Shrill Howler // Howling Chorus 82%
$0.18#21146
"Creatures with power less than this creature's power can't block it."
Wandering Wolf 82%
$0.06#19575
"Creatures with power less than this creature's power can't block it."
Feasting Hobbit 82%
$0.37#4057
"Creatures with power less than this creature's power can't block it."
Battering Wurm 82%
$0.09#25219
"Creatures with power less than this creature's power can't block it."