Sacellum Godspeaker

Most mana dorks read the battlefield: a tapped land, a creature on the table, mana already committed. This one reads your hand instead, paying out green not for what you have invested but for what you are still holding. The constraint that prices it is the power-5-or-greater threshold and the reveal-not-cast structure: the fat creatures stay in hand, fully visible to the opponent, while their stored mana spills out a turn early. That makes the card a ramp engine for exactly one kind of deck, the green fatty pile that wants to flood the board with oversized bodies and needs to do it before its hand empties. The math scales with the size of your unplayed monster pile, which is the same hand you are trying to dump, so the ability is at its strongest in the precise window where it is also about to make itself redundant. It is a piece of green's recurring fascination with rewarding decks for hoarding giants rather than just casting them, the same impulse that animates cards keyed to high power and graveyard fatties. The 2/2 body is incidental; the value is in the reveal, and the reveal is only as good as the army still waiting behind it.