Shimatsu the Bloodcloaked Mono-red sacrifice fodder almost instantly means Treasure tokens or goblin tokens
To note there is a solid 1-drop in Ankle Biter as well as a total of three solid common 2-drops (including Bristlepack Sentry and Voracious Varmint), making building a good curve fairly easy
The main problem with Pest is that it does nothing on its own, which is normally a complete no no for a cube card however one mana spells, especially artifacts are far more forgiveable
If you play a Thalia, Guardian of Thraben to slow down your opponents, then you can also include a Pearl Medallion to offset this effect for yourself
It can't be the target of spells or abilities, its static abilities have no effect on the game, its triggered abilities can't trigger, it can't attack or block, and so on
Trostani, Three Whispers These three are downright dangerous