Prime Speaker Vannifar is not a great choice , as the majority of your creatures will be tokens with a mana cost of zero
Conductor of Cacophony In the tradition of Pestilence creatures like Thrashing Wumpus and Pestilence Demon comes a new challenger, Conductor of Cacophony
This means that market values are still going to see considerable fluctuations as more people open card packs and find some of these treasures for themselves, yet the prices that have been seen online are a good indication of which cards are the most desirable
Its good if you manage to blink it to get the most out of a commander entering the battlefield
Which, aside from meaning you can effectively play two spells with a single card, also means that once you cast an Adventure, its associated creature is safe from forced discard effects
The upkeep step still happens, but it just happens instantly and is quickly moved past