Sea Serpent [Alpha Edition] Tribal Enchantment if Whirling Dervish dealt damage

if Whirling Dervish dealt damage to an opponent this turn

Set: Morningtide Type: Creature — Elf Druid Rarity: Rare Cost: {3}{G}{G} Whenever you cast a Druid spell

Until that player's next turn

Set: Commander 2016 Type: Sorcery Rarity: Rare Cost: {4}{W} Each creature deals damage to itself equal to its power

you may look at the top card of your library

Sea Serpent [Alpha Edition] Tribal Enchantment if Whirling Dervish dealt damageSet: 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?