Its the best counterspell you can possibly play
The rest of the deck is filled with cards that either are creatures that modified themselves, have effects that let you modify creatures, or are spells that help modify your creatures
Even a simple four power creature will break this in half, and if you dont have your Yeva, Nature's Herald out, then you can still get three lands from your Troll Ascetic or something
For instance, transforming Invasion of Amonkhet into Lazotep Convert to copy Aclazotz, Deepest Betrayal from your graveyard can effectively create an unkillable creature
Upon entering the battlefield, this commander lets you exile any number of non-land permanents you control until Abdel Adrian leaves the battlefield, creating a 1/1 Soldier for each permanent exiled this way