Mesmeric Sliver [Future Sight] 170 Set: Future Sight Type: Enchantment

Set: Future Sight Type: Enchantment Rarity: Rare Cost: {4}{B}{B} At the beginning of each player's upkeep

what is that

Morph {4}{R}{R} (You may cast this card face down as a 2/2 creature for {3}

You may cast a spell with mana value X or less from among cards revealed this way without paying its mana cost

Mesmeric Sliver [Future Sight] 170 Set: Future Sight Type: EnchantmentSet: Future Sight Type: Creature Sliver Rarity: Common Cost: {3}{U} All Slivers have "When this permanent enters the battlefield, you may fateseal 1." (To fateseal 1, its controller looks at the top card of an opponent's library, then they may put that card on the bottom of that library.)