To me its somewhat fair since it doesnt stop opponents who are on a self mill plan - unlike Rest in Peace, for example
But you harness it by paying seven mana which exiles a creature you control
Though it's a huge blow out if someone kills The Great Synthesis after chapter two, as you'll have bounced your own commander to hand and be left with no resources except the 14+ cards in your hand (how will you cope?), if you are able to get the final chapter off, it's basically a guaranteed game over
It's a cheap card, and if you block with the tokens it gave you, then it has enough rampage that you can still smash over them and kill them all
Odds are you are going to get something more damaging from the randoms even with less information
Many creatures have a "party creature type" almost coincidently tacked onto them, too, so the deck gets to play some generally powerful creatures that overlap with the strategy