Sigismund Dijkstra, Spy Master

As long as Dijkstra is in Dijkstra's owner's opponent's hand, Dijkstra's owner may cast Dijkstra and activate Dijkstra's abilities. That opponent can't cast Dijkstra and plays with their hand revealed.

{u}{b}, {t}: Put Dijkstra into target opponent's hand.

{3}{u}{b}: You may play a land or cast a spell from the hand Dijkstra is in. If you cast a spell this way, you cast it without paying its mana cost.