You also have access to Selesnya lifegain powerhouses like Trostani, Selesnyas Voice, and a variety of tokens with lifelink, like the soldiers from Guilds of Ravnica and the cats from Amonkhet block, so you can also use token effects like populate to increase your life gain
Because all the generation 1 cards in this game have been replaced with generation 2 cards, and everything has been balanced
Bloomburrow is now out and players simply can't get enough of it
Any graveyard-based tutors like Entomb or Buried Alive will do the trick, as will self-Mill and Surveil effects like Desmond Miles
Part of what makes it so hard to reprint is the very specific name it has, as Argoth is an island on Dominaria, which was mostly destroyed during the events of the Brothers War, so its not like Magic can just reprint this card in Innistrad and call it good
Of course, some of the best spot removal in Red are burn spells