Von Neulam, Ergodic prototype

As you draw Von Neulam, or at the beginning of
your unkeep if its in your hand, you may reveal it.
Whenever you reveal Von Neulam choose a
random card you own from outside of the game.
Until your next turn, Von Neulam becomes a
copy of that card.
{4}{u}{b},{t}: Return Von Neulam to your hand.