You have Somberwald Beastmaster and Trostani's Summoner to support the handful of coven cards, though thats two support pieces for about four cards, and so on
adds a whopping four lore to the card if the inkwell has ten or more cards in it
This can even lead to a meta Hope Spot, because it's entirely possible to be capable of winning the duel with Wiegraf and then be incapable of winning the fight against Velius/Belias, a boss that could be even more difficult than Wiegraf, that happens immediately after
This can make the already powerful Angel cards become even stronger and create dominating threats on your board
Angel of Indemnity is a 5/5 Angel Warrior creature with flying and lifelink that lets you return a permanent card with mana value 4 or less from your graveyard to the battlefield.The coolest thing about this card: it has Encore for 8
The other stuff is nice, but that alone seems good