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Let's say I'm playing Sentinels and I have Ironhide - Steadfast Brawler in my KO area in Alt mode. I flip him to Bot mode, giving my characters Pierce 2 until the end of the turn. If I then put a Combat Commands onto one of my Bots in play, let's say Prowl - Strategic Mastermind, attack with him, and use Combat Commands to Trigger Ironhide's KO ability, do my characters get pierce 4 until the end of turn, or does it stay at pierce 2?

Each characters ability is separate and stacks, so in this scenario you would end up with Pierce 4.
Source: Wizards of the Coast (2019-06-07)    【Link to Ruling】
Tags: Ironhide, Steadfast Brawler