The first copy cast can end up under an opposing Ixalans Binding, locking the rest of your copies from ever being cast
Umbral Collar Zealot is one of the strongest in this department, considering its already a 3/2
While it offers versatility, there may be better options depending on the specific deck archetype, such as Mulldrifter for card advantage or Grave Titan for token generation, making Phenomenon Investigators a situational inclusion that could see play in certain metagames
An artifact destruction spell that puts a creature in the yard works amazingly with all sorts of commanders, like Meren of Clan Nel Toth and Korvold, Fae-Cursed King
Fans of Experiment 626 will find a lot to love about its unique artwork, and the card itself isn't half bad
Bonfire of the Damned The ability to have your Rolling Earthquake be instant speed and one sided is quite the boost