At the beginning of each player's end step, that player draws a card. If the player is your opponent and has four or more cards in hand, Fevered Visions deals 2 damage to that player.
2016-04-08
No player may take any action in between the two steps of Fevered Visions's triggered ability, so if your opponent has four or more cards in hand after drawing a card, Fevered Visions will deal 2 damage to that player.