Hall of Storm Giants

The whole appeal of a manland is that it never costs you a card, and the price of that free win condition is always paid in the manabase: it comes in tapped when it matters most, and it dies to sweepers and land destruction the untapped fatty in your hand does not. This one prices its ceiling steeply. The activation is a real investment, and swinging with it effectively ties up seven mana sources (the six to turn it on, plus the Hall itself), but the body it buys is deliberately hard to profit against: ward 3 turns every removal spell into a tax, so the tempo math that usually punishes manlands (kill the creature, keep your land drop, walk away up a card) stops working. The opponent either pays the ward and then pays for the answer, or they let a 7/7 keep swinging. That is the design tension: a land that mostly sits there producing blue does nothing threatening, so the cost of holding it is only the enters-tapped clause; the moment your board can afford the activation, it converts into a clock that is expensive to interact with rather than expensive to cast. The lineage runs through the Worldwake creaturelands and their descendants, but the ward clause is the modern wrinkle those older designs lacked, shifting the card's role from a cheap early beater to a late-game finisher that outlasts the removal a control mirror is built to trade.