Sea Serpent [Alpha Edition] SM145 Whenever an artifact or creature

Whenever an artifact or creature enters the battlefield untapped and under an opponent's control

Set: 30th Anniversary Edition Type: Enchantment — Aura Rarity: Common Cost: {G} Enchant land

“Her talent for slipping unseen behind enemy lines provided information that would prove crucial to Dominaria's defense

Set: POP Series 3 Type: Fire Rarity: Ultra Rare Retreat cost: Colorless

then roll a d20

Sea Serpent [Alpha Edition] SM145 Whenever an artifact or creatureSet: Alpha 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?