Sea Serpent [Beta Edition] Mirrodin Besieged Undying (When this creature dies

Undying (When this creature dies

Set: Weatherlight Type: Land Rarity: Uncommon Gemstone Mine enters the battlefield with three mining counters on it

Set: Dark Ascension Type: Creature — Human Rarity: Uncommon Cost: {4}{G} Vigilance

(They can't be blocked as long as defending player controls a Forest

At the beginning of the upkeep of enchanted creature's controller

Sea Serpent [Beta Edition] Mirrodin Besieged Undying (When this creature diesSet: Beta Edition Type: Creature Serpent Rarity: Common Cost: {5}{U} Sea Serpent can't attack unless defending player controls an Island. When you control no Islands, sacrifice Sea Serpent. Legend has it that Serpents used to be bigger, but how could that be?