Planeswalker's Favor

Pumping a creature by reading an opponent's hand is a strange way to size a combat trick, and it makes for one of the more conditional repeatable buffs of its era. The four-mana activation asks an opponent to flip a card at random, then converts that card's mana value into a temporary boost: a revealed land does nothing, a revealed fatty wins a swing outright. That randomness is the whole problem and the only charm. You are not choosing the bonus, the opponent's draws are, which means the same activation can read as a blank or as a game-ender turn to turn with no input from you. The hand-reveal is incidental information rather than disruption, since the card returns to the opponent's hand untouched. As a Pernicious Deed-era green enchantment, it sits in the part of the design history where pump effects were still experimenting with cost structures more elaborate than a flat +X/+X, and the result is a card whose ceiling is real but whose floor is the floor of a die roll. It rewards you when an opponent holds expensive spells and punishes you against decks that have already emptied their hands, which is precisely backwards from when you most want a combat boost. A curio of green's variance-tolerant phase rather than a workhorse.