cards like fling mtg New Bloomburrow Uncommon Creates Competitive Deck! Fling deals damage equal to the sacrificed creature’s power to target creature or player. Fling | Dark Ascension |

Why not double it

The same holds true against other creatures that can achieve a high toughness like Ledger Shredder, Murktide Regent, Tarmogoyf, Construct tokens and the like

This is the quintessential "slippery slope" where one seemingly reasonable argument opens the door for another, and another, and the next thing you know we might as well just be playing with 20 life, 10 infect, and no "special treatment" card list

Steel characters, such as Anna True-Hearted, keep your quests safe with high resilience, while items like Imperial Bow give a significant combat advantage, granting keywords like Challenger and Evasive to tip fights in your favor