Nightmare [Collectors' Edition] Phyrexian Elf Scout Undersea Invader enters the battlefield

Undersea Invader enters the battlefield tapped

and library for all cards with the same name as that artifact and exile them

" —Robert Muldoon

When you win the flip

Nightmare [Collectors' Edition] Phyrexian Elf Scout Undersea Invader enters the battlefieldSet: Collectors' Edition Type: Creature Nightmare Horse Rarity: Rare Cost: {5}{B} Flying (This creature can't be blocked except by creatures with flying or reach.) Nightmare's power and toughness are each equal to the number of Swamps you control. The Nightmare arises from its lair in the swamps. As the poisoned land spreads, so does the Nightmare's rage and terrifying strength.