The First Sliver (Retro Foil Etched) [Modern Horizons] Human Soldier Nightmare's power and toughness are

Nightmare's power and toughness are each equal to the number of Swamps you control

Set: Sun & Moon: Burning Shadows Type: Fighting Rarity: Ultra Rare Retreat cost: Colorless

Put that card into your hand at the beginning of your next end step

Creatures those players control that can block additional creatures may likewise be put into additional piles

The First Sliver (Retro Foil Etched) [Modern Horizons] Human Soldier Nightmare's power and toughness areSet: Modern Horizons Type: Legendary Creature Sliver Rarity: Mythic Cost: {W}{U}{B}{R}{G} Cascade (When you cast this spell, exile cards from the top of your library until you exile a nonland card that costs less. You may cast it without paying its mana cost. Put the exiled cards on the bottom of your library in a random order.) Sliver spells you cast have cascade.