Description, catalog fields, rules text, and how it plays—in one place.
eBay sold comps from the Vendor Tools public catalog — tap a condition below to filter sales, or refresh to pull new data into the catalog
This creature can't attack unless defending player controls an Island. {5}{U}{U}: Monstrosity 3. (If this creature isn't monstrous, put three +1/+1 counters on it and it becomes monstrous.) When this creature becomes monstrous, target land becomes an Island in addition to its other types.
Abilities, attacks, weakness & resistance
Other cards from Theros
Share your thoughts on this card — condition, value, pull rates, etc.
to comment.
No comments yet. Be the first to share your thoughts.
Sealock Monster (THS-62) is an uncommon blue Creature — Octopus from the Theros expansion. It has an activated Monstrosity 3 ability that places three +1/+1 counters on it and a triggered effect that makes a target land become an Island when it becomes monstrous. Its static attack restriction prevents it from attacking unless the defending player controls an Island, making its best role one of board presence and land disruption rather than immediate aggression.
Catalog pricing data as of 18 Apr 2026, 00:02
