He can put counters on creatures to trigger things like card draw, he can gain us life to help trigger cards like Aerith, and he can return Summon creatures from the graveyard to play
There's a vast gulf between Bellowing Aegisaur and Etali, Primal Storm or even Earthshaker Dreadmaw, for example
This means you get the full effect if you get it early
Its an incredibly pushed commander before we consider Sephiroth, One-Winged Angel, which scales into a game-ending threat with little effort
[19] After Quinton brought Hart Tenjo to an abandoned gallery, Quattro watched as Vetrix begins his ritual in order to transfer all of Hart's powers and memories to himself
That said, there is some potential for a control deck that runs Engulf the Shore and Possessed Skaab together