That assessment is both right and wrong
Designing the Warhammer 40,000 Commander Decks Welcome to the grimdark of the far future
Note that the tokens it makes are blue and red to allow them to convoke for those two colors
Finally, the deck has a ton of removal spells and counterspells to help you keep opponents at bay in the early game, card draw effects, and a ton of different synergies when Toxrill starts taking down your opponents' armies (such as drain effects when their creatures die, reanimate effects, card draw, etc)
It also received some sweet alternate art printings that have been going for big bucks on the secondary market
He'd be better in a deck that focuses on both paradox triggers and copying spells, however, making him a less effective combination than Yasmin and 13