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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
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Sealock Monster (THS 62, foil) is a blue Creature — Octopus from Theros. It has an activated Monstrosity 3 ability that costs {5}{U}{U}, and it can't attack unless the defending player controls an Island. When it becomes monstrous, it turns a target land into an Island in addition to its other types, providing a long-lasting land-type change that can enable its attack restriction or synergy with Island matters effects.
Catalog pricing data as of 14 May 2026, 08:51
