Essence Pulse
Most black sweepers commit to their toughness reduction up front: Infest lands a flat -2/-2, and every printing of that shape wipes a known slice of the board. This one refuses to name its own size. The two life it hands you is only the seed; the -X/-X counts every point of life you gained this turn, so the reach of the wipe is a number you assemble across the turn rather than one the card sets by itself. On its own it clears the smallest tokens and mana dorks, a modest effect for the cost. Chain it behind other lifegain and the minus grows without bound, which is the tension the effect resolves: a sweeper whose ceiling is written by the deck around it rather than by its mana cost. The symmetry is the honest part of the design and easy to misread. Every creature shrinks by the same X, the caster's included, so this is not a one-sided wrath waiting to be unlocked; a lifegain shell that inflates X to erase the table erases its own board along with it. The card rewards you for setting up a large life swing, then charges you for it by treating your creatures no differently. Its natural home is a deck built to survive its own sweep, one whose threats sit above whatever X it can reach or one content to reset an empty board it can rebuild first.
