Psychic Possession

The trade it asks you to make is one of the strangest in blue's history: you surrender your own draw step permanently and tether your card advantage to an opponent's habits. Mechanically it is a swap, not a multiplier. You skip your draw, and each card the enchanted opponent draws lets you draw one back, so their ordinary turn replaces the draw you gave up at a flat one-for-one. The leverage only appears when the opponent draws more than once per turn: dig spells, wheels, their own Howling Mine or Font of Mythos effects, every extra card on their side becomes a free card on yours that you never paid to skip. The card is only as good as the deck across the table is greedy. Against a hellbent aggressor content to dump their hand and never refill, you have paid four mana to stop drawing cards. That conditional payoff is the entire design: blue card advantage that costs nothing on the surface but mortgages your own engine to someone you do not control. Skipping your draw step is the price that stops this from pointing a one-sided Howling Mine at yourself for free, and the "may" on the trigger spares you from decking when the opponent draws into some multi-draw burst. It is a piece of design built around parasitism rather than tempo, which is why it has anchored donate-and-stax and group-draw shells where the symmetry can be bent decisively in one direction.