Later on, Co-Leader designer posted this letter to the Lorcana Discord, which goes into more detail on why the two cards were banned: Dear Illumineers, We are writing to address the recent decision to ban the cards Hiram Flaversham –
The alternate commander, Saint Traft and Rem Karolus cares about it being tapped itself and can untap itself when a card with convoke is cast
You cast the copy of Emrakul, the Promised End as The Heron Moon's last ability resolves
The same Fandom wiki article covers a handful of the missing cards that might have appeared framed as above (though there are many more hiding in plain sight that I cant talk about)
Bouncing all nonlands for seven on your turn is basically just a worse Cyclonic Rift, but the ability to end an opponents turn if you pay the extra three is really something
Lets figure out which bloodsuckers are the best to drain the pod