The Swarmlord is a mix of two different mechanics, +1/+1 counters and death triggers
Thats rare, thoughwith Lurrus and Collected Company, you have enough redundancy and resilience that your combo can go off even when disrupted, and you can even sandbag your combo to deploy when your opponent is off-guard, as it costs 2BWG in total
This will have a big presence on the battlefield
Taffyta Muttonfudge Sour Speedster 4
overall, but which is best for a specific job
Its not uncommon for red commanders such as Krenko, Mob Boss to have a stray Goblin Recruiter or Dockside Extortionist around to sacrifice and pay the cost for this spell, but the place where it will shine the most is in partner decks including Rograkh, Son of Rohgahh