Sealock Monster

Sealock Monster

Creature - Octopus | Power/Toughness: 5 / 5 (CMC 5)
Sealock Monster can't attack unless defending player controls an Island.
: 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.