Question. If I enchant myself with Curse of Fool's Wisdom and have Greven, Predator Captain on the field, for each card I draw, I would lose 2 life, gain 2 life, and Greven's power would increase by 2 for the turn. Is this correct?
While you control Greven, Greven's second ability counts the amount of life you've lost this turn, even if you regained that life immediately after you lost it, as with Curse of Fool's Wisdom's second ability (C.R. 109.5). Notably, Greven's second ability cares about life loss events, not the net change to any player's life total since the beginning of the turn.
Greven, Predator Captain and Curse of Fool's Wisdom