If it is put into your graveyard, exiled, or would otherwise leave the battlefield, you may put it back into the command zone
If you want card draw on entry, get Eye of Vecna and you can get a little value every turn thereafter
Putting two +1/+1 counters on creatures without needing any synergies is already quite an engine, and Zimones activated ability is much stronger than proliferate, or much faster than Vorel of the Hull Clade
Casual players love Vampires, too, and there are plenty of solid Vamps in Standard at least while Ixalan is still legal
Rhystic Study The source for the infamous Do you pay the 1? question, Rhystic Study is blues best card draw effect in Commander
How this affects your grade: Corners accounts for a significant portion of the overall grade