Logistical Hub & Supply Network

Storehouse {10} (You may equip {x} many land and/or mana-generating cards to this card, where {x} is the number of cards the Storehouse can hold. An equipped card is hexproof, and may be withdrawn to be tapped at any point during the game.If it is a non-land permanent, only its mana-generating abilities can be used. It must be unequipped to use other abilites.) {T} Create 1 colorless mana per 2 cards equipped via Storehouse. This must be spent to cast a card during this turn. {flavor} The humble steam engine can revolutionize the cities of even the most mana-starved planes. It can do a pretty good job of arming them, too.