Molten Psyche

Oracle Text

Each player shuffles the cards from their hand into their library, then draws that many cards.

Metalcraft — If you control three or more artifacts, Molten Psyche deals damage to each opponent equal to the number of cards that player has drawn this turn.

Card Rulings

1/1/2011 If a player doesn’t have any cards in their hand, the player will still shuffle their library.
1/1/2011 The metalcraft effect counts all cards each opponent drew for any reason during that turn, not just the cards those opponents drew due to Molten Psyche’s first effect.