The First Sliver (Retro Foil Etched) [Modern Horizons] Elf Archer Set: Rivals of Ixalan Prerelease

Set: Rivals of Ixalan Prerelease Promos Type: Creature — Merfolk Shaman Rarity: Rare Cost: {3}{G} Whenever World Shaper attacks

Set: Ixalan Prerelease Promos Type: Creature — Merfolk Warrior Rarity: Rare Cost: {3}{U} Creatures you control with +1/+1 counters on them can't be blocked

which possess the stability of ancient mountains

When Mogg War Marshal enters the battlefield or dies

The First Sliver (Retro Foil Etched) [Modern Horizons] Elf Archer Set: Rivals of Ixalan PrereleaseSet: 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.