The First Sliver [Modern Horizons] Eternal Masters you may return that nonland

you may return that nonland permanent card to the battlefield instead

you may have its controller create a 1/1 white Warrior creature token that's tapped and attacking

−2: Draw a card for each tapped creature target player controls

Set: Battle for Zendikar Promos Type: Legendary Creature — Eldrazi Mythic Cost: {10} When you cast this spell

The First Sliver [Modern Horizons] Eternal Masters you may return that nonlandSet: 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.