Chimeric Staff

Most animation effects fix the body they create: a manland resolves to a 3/3, an artifact snaps to a 2/2, the number printed and locked. This one converts mana into stats at a flat one-per-point rate, so the size is whatever your pool can afford the turn you pull the trigger. Early, it is a chump-sized nuisance; flooded out late, it is a one-card finisher whose dimensions you set on the spot. That open-ended conversion keeps it out of combat math until activation: an untapped staff threatens any X you can pay, forcing an opponent to play around a creature that does not yet exist. The until-end-of-turn window is what you trade for that flexibility, demanding the mana be re-paid every turn the staff wants to attack or block, and with no built-in protection, everything you sink in is exposed to any removal pointed at creatures. It is the colorless, repeatable answer to the question of what to do with a board full of lands and nothing to spend mana on, and it asks that question again every turn it survives.