Viscera Seer is one of the most popular sacrifice outlets in the format, Mistcutter Hydra is an enormous threat, and Dryad Arbor is even a land
Read: MTG: Bloomburrow is brimming with adorable, deadly critters Beyond Astarion, there also more Baldurs Gate 3 representation in this collection, in the form of a full art Karlach, Fury of Avernus
Despite costing 3 mana, theres only 1 black pip in its mana cost, making it easily accessible to any black deck, and then you simply get to find any card you want from your deck and put it into your hand without any fuss
Getting to cast creatures from your library gives you so much card advantage, and the fail-safe is a respectable 2/3 body for 3 mana
The problem is that secondary-market prices for chase cards from these sets are often wildly inflated