Not only would your opponent have to pay mana to get through you, but the Archon itself has protection from white, making it a solid wall that was almost impossible to remove
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While the format did have Thoughtseize, beyond that, it lacked cards like Force of Will or Wasteland, which have historically helped keep degenerate combo decks in check without having to play very narrow answers that only hit one or two decks
Note: Sleeve compatibility with fit sleeves
For a deck that just wants to flood the board as fast as possible, playing cards like Wrenns Resolve and Reckless Impulse is already a good idea, and getting free Thopters for doing so is amazing
Sokka is among them, with his Sokka, Tenacious Tactician version empowering ally creatures and creating ally tokens in Jeskai colors