Cloud Key - [Schematic] The Brothers' War Retro Artifacts (BRR) Creature Put a number of +1/+1

Put a number of +1/+1 counters on it equal to the amount of life you gained this turn or the amount of life you lost this turn

and you decide whether to flip again

"At this rate I fully expect to be replaced by a clockwork golem by year's end

Castle Locthwain enters the battlefield tapped unless you control a Swamp

Agnur soon learned that their blades were quite solid—and razor-sharp

Cloud Key - [Schematic] The Brothers' War Retro Artifacts (BRR) Creature Put a number of +1/+1As Cloud Key enters the battlefield, choose artifact, creature, enchantment, instant, or sorcery. Spells you cast of the chosen type cost {1} less to cast. "A key only unlocks a door. Its wielder must choose whether to cross the threshold." *Hurkyl's Metaphysics, vol. II*