The Ruinous Powers
Universes Beyond: Warhammer 40,000
At the beginning of your upkeep, choose an opponent at random. Exile the top card of that player's library. Until end of turn, you may play that card and you may spend mana as though it were mana of any color to cast it. When you cast a spell this way, its owner loses life equal to its mana value.
Most of our single cards are second-hand, carefully checked, but some can also come directly from recent openings.