Id lean on changelings along with anthems to speed things along since the snails it creates grow super slowly
Altar of Dementia is one I always pack in a deck like this, because it lets you play my favorite reanimator card: Living Death is great in a list like this, because all of the creatures you sacrifice to it will create token copies, which makes it hilariously one sided
This Duskmourn Commander is one of the strongest cost reducers in the game, even if you're restricted to the first enchantment you draw in a turn, and is very flexible: Aminatou, Veil Piercer EDH decks can be built in lots of different ways
Boros decks tend to feel same-y as a result, but if black mana is added, then players get one of the best Commander decks for aggro: Isshin, Two Heavens as One
And god help you if youre attempting to masterset any of the increasingly bigger and bigger sets The Pokmon Company has been putting out to capitalise on all this
Its extremely easy to misplay just because you dont know how to make the cards interact with each other and with the Pendulum mechanic