Arguel's Blood Fast // Temple of Aclazotz

The Greed effect with a built-in escape hatch. Repeatable card draw at the cost of life has a long pedigree, and the standing problem with it is that the engine never knows when to stop: you draw yourself low, and the cards you found have to outrun the life you spent finding them. This design answers that with the transform clause, which turns the failure state into a deliberate gear shift. Drop to five or fewer and the front face stops being a liability you have to manage and becomes a land that produces black mana and trades your board into life back: the same body of creatures that protected you now refuels you. The conditional flip matters more than the symmetry suggests, because it only offers the switch when you actually need it. Above five life you keep drawing; below it you can pivot to stabilizing, sacrificing spent creatures for their toughness rather than dying with cards in hand. The two halves answer the two ways a life-for-cards engine kills you: the front face is the throttle, the back face is the brake. What it asks in return is that you commit a mana source and a noncreature permanent to the slot before you know which mode you'll need, and that you have enough toughness lying around to make the lifegain side worth flipping into.