But the core idea of using creature cards as removal has only become stronger over time and in decks which are built around the assassin type, there are ways to make murder even more rewarding
Zhulodok, Void Gorger has brought about a big resurgence in people playing colorless decks
You can sometimes "splash" a third, playing two colors as your base and a couple powerful cards or additional costs of another color, but I'd really focus on the two colors you want here
For example: Explorer's Scope is a card I ironically love, but I'll be the first to admit that you absolutely need a ton of topdeck manipulation to make this card good, which this deck simply does not provide
Spiteful Banditry There are actually a handful of board wipes that leave behind Treasure tokens, though Spiteful Banditrys one of my favorites, since it continues to make treasure as creatures die on later turns