Sealock Monster - Theros (THS)

Sealock Monster - 3, Blue, Blue

Creature - Octopus

Uncommon - Theros (THS)

Sealock Monster can't attack unless defending player controls an Island.

5, Blue, Blue: Monstrosity 3. (If this creature isn't monstrous, put three +1/+1 counters on it and it becomes monstrous.)

When Sealock Monster becomes monstrous, target land becomes an Island in addition to its other types.

5/5