Sea Serpent [Fourth Edition] Merfolk Rogue When Cavalier of Night enters

When Cavalier of Night enters the battlefield

Inventors Type: Basic Land — Island Rarity: Common ({T}: Add {U}

target player loses life equal to the number of cards in their hand

Set: Innistrad: Crimson Vow Prerelease Promos Type: Creature — Plant Beast Rarity: Mythic Cost: {4}{G}{G}{G} Trample

Set: 30th Anniversary Edition Type: Instant Rarity: Uncommon Cost: {U} Cast this spell only during an opponent's turn

Sea Serpent [Fourth Edition] Merfolk Rogue When Cavalier of Night entersSet: Fourth 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?