Selfless Cathar

Sacrifice it for the swing and the whole board grows: that activation is the entire reason this 1/1 exists. A one-mana body asks nothing of your curve to enter, but the payoff costs on top, so the math only resolves on a later turn when you have the mana free and a wide board to amplify. That structure is the point. Because the pump is a sacrifice activation rather than a static anthem, it sits as a held resource: you commit the creature early, then fire the +1/+1 at instant speed during combat, after blocks are declared, when the opponent has already sized their trades against the board they could see. The buff hits every creature you control, so the more attackers in the red zone, the more lethal the surprise becomes, and the cathar itself is gone from the equation since you sacrifice it to power the swing. The friction is real: a one-drop that needs two more mana before it does anything is a tax in the turns you would rather be deploying threats. What it buys back is reach. A go-wide board that looks one creature short of lethal frequently is not, and this is the line that finds those last points of damage on the attacking step, after the defender has committed blockers to a board they thought was safe.