Charge of the Forever-Beast
Green rarely gets to point removal at a creature and pull the trigger, so when it does, the effect has to be paid for somewhere other than color-pie logic. Here the price is a card you show but keep: the damage scales off the power of a creature you reveal from hand, not one you commit to the board. That reveal-not-discard structure is the whole balancing act. It rewards a hand already stocked with fat green threats (a five-power creature turns this into a clean kill for a modest cost) while doing nothing when your hand is empty or full of small bodies. The card you reveal stays castable next turn, so you are never trading two cards for one; you are borrowing a creature's power to point damage somewhere and handing the creature back.
The result is a fight-style effect stripped of the risk that usually defines the archetype. Prey Upon asks your creature to survive the exchange and exposes it to a combat trick or a chump block; even Rabid Bite, which deals damage one way, still demands a creature on the battlefield the opponent can pressure or answer. This measures against a card that never leaves your hand and never touches the battlefield. Green's sorcery-speed answer to a planeswalker or an oversized blocker becomes a function of how top-heavy your deck already wants to be, a deckbuilding tension green is comfortable leaning into rather than a weakness the card has to apologize for.
