It was a really cool idea that panned out to be less fun than I had anticipated
This enter the battlefield effect would normally cost you two mana on its own, so the fact that it's tacked onto Siege Rhino provides incredible value
That means that you don't need to run this with Zombies since he brings his own, and instead can be a unique Aristocrats build, or a Zombies-matter builds or just a legendary matters brews
Prosper, Tome-Bound Treasure and card-draw Tiefling warlock Prosper, Tome-Bound is a four-mana black and red 1/4 with Deathtouch that does a lot all on its own, but none of that is really combat-based
The Kami War // O-Kagachi Made Manifest is expensive and 5-colored, but it is a card with great value for Saga Tribal, offering on two different chapters, target removal (at I exiling target nonland permanent and at II returning target nonland permanent to its owners hand)