Being able to cast any spell by paying means you can play most high-mana value chaos cards for way cheaper, allowing this 5-color commander to destabilize the table early
Once you reach the phase of the game where you can afford to do multiple things per turn, you need card draw to ensure you keep having things to do (Circle of Power, Fight On!, Travel the Overworld) or at least cards which can be used multiple times (flashback spells, Ring of the Lucii, Shambling Cieth, Relentless X-ATM092)
Learn to play with Storm of Blades, Large and in Charge, or another starter deck
Infernal Captor does need a creature that generates a token creature when it enters or another persist creature
Even with a small number of tokens available, Immersturm Predator is nearly impossible to remove
Players simply didn't understand it, leading to the now infamous one-star rating by former TCG magazine Inquest