Ivy Seer

The pump engine here is built on a tax most green decks already pay: holding green cards in hand. Reveal them (you do not discard or spend them, only show), and a creature swells by exactly that count until end of turn. The clever part of the design is that the cost is informational rather than material. You are not sacrificing resources to the pump; you are exposing your hand, trading the secrecy of your remaining green cards for a combat swing. That makes the activation strongest in exactly the moment it is weakest tactically: late, with a full grip, when revealing everything also tells the opponent every threat you are still sitting on. The activation plus the tap means this is a slow, repeatable mana sink rather than a surprise, and the body that carries it is fragile enough that any spot removal turns the whole engine off. It belongs to the family of green creatures that convert a flooded hand into board pressure, a recurring design itch Wizards has scratched in many shapes over the years. Ivy Seer's particular answer is unusually honest about the cost: the more green you are holding, the bigger the pump, but the more you reveal about your plan to do it.