Rishkar's Expertise [Aether Revolt Prerelease Promos] Dragons of Tarkir Prerelease Promos you may put a -1/-1

you may put a -1/-1 counter on target creature

Then each player reveals their chosen card

if you have no cards in hand

Whenever an opponent casts a blue or black spell during your turn

that player loses 2 life

Rishkar's Expertise [Aether Revolt Prerelease Promos] Dragons of Tarkir Prerelease Promos you may put a -1/-1Set: Aether Revolt Prerelease Promos Type: Sorcery Rarity: Rare Cost: {4}{G}{G} Draw cards equal to the greatest power among creatures you control. You may cast a spell with mana value 5 or less from your hand without paying its mana cost. "Control the Great Conduit? You might as well try to divert a river with your hands."