Tromokratis is a uncommon Legendary Creature — Kraken card from Commander Masters (CMM), collector number 129. Current market price: $0.19 (foil $0.29), TCGplayer market prices via Scryfall.
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.)