Overall, this can be a really slow deck, and the strategy of sleep stalling can be greatly hindered by your opponent evolving and leveling up their Pokmon, or if they are just getting really lucky with coin flips
Forgotten Creation works wonders with our Esper Zombie Tribal as it provides us with a repeatable wheel effect at the beginning of our upkeep
Finally, the deck aims to put tons of cards into your graveyard, and then take advantage of this (for example with Izoni, Thousand-Eyed, Golgari Grave-Troll, Jarad, Golgari Litch Lord, etc)
Wed eventually begin to see other types of supplemental sets that introduced new cards to the game but still wouldnt be introduced to Standard as traditional expansions
If you have any deckbuilding questions or need more play advice for these commanders, please let me know