Sealock Monster - Theros #62

Sealock Monster

Set: Theros (THS)
Collector Number: 62
Type: Creature — Octopus
Rarity: Uncommon
Mana Value: 5.0

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.