They have no effect while the companion is outside the game
In addition to forcing each player to skip their discard phase, Anvil of Bagardan grants each player an additional draw at the beginning of their draw phase, but then they must choose and discard a card from their hand, offering those playing with graveyard shenanigans the free discard outlet they would have gotten at the end of the turn but now just at the beginning, meaning they could take advantage of it during their respective turns
Faith's Fetters doesn't stop static abilities, triggered abilities, or mana abilities from working
But where Exhume can lead to some nasty blowouts or fall off quickly after the first few turns, Stitch Together offers the most natural condition most graveyard decks could hope for: you just have to load up your yard a little, and away you go
I took a seat and started to look through the gift box, here are some of the cards I found