Rescue Retriever

The flash clause is the entire argument here. As a sorcery-speed anthem this is a fine but forgettable Soldier lord; cast at instant speed, mid-combat, after blockers are declared, it becomes a two-front ambush. The counters land before combat damage resolves, so a team that was trading evenly suddenly out-sizes its blockers, and the damage-prevention shield turns what should have been a clean block into a wall your attackers walk through unscathed. That combination rewrites a combat step the opponent has already committed to, a much sharper thing than a lord that merely grows a board on your own turn. Note the asymmetry the design writes into both effects: the enters-trigger puts counters on each other Soldier, and the prevention covers other attacking Soldiers, so it neither grows nor shields itself. It buffs the squad it drops into rather than pumping its own body, which keeps a five-mana 3/3 from doubling as a hard-to-kill threat and points the card squarely at a go-wide token or tribal shell where the surrounding bodies are what matter. The prevention is a static ability, not a one-shot trigger, so once the creature is on the battlefield it holds for the whole combat, letting a wide attack punch through interaction that would otherwise blow it out.