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
But it's a lot of work to get all that setup
Illustrated by Lucas Graciano Standard Legal Alchemy Legal Pioneer Legal Historic Legal Modern Legal Brawl Legal Legacy Legal Comp
We actually have a ton of really good sagas for this, including King Narfi's Betrayal, Kiora Bests the Sea God, The Cruelty of Gix, The Eldest Reborn, The Horus Heresy, The Shattered States Era, and The Trickster-God's Heist
Mark Rosewater placed Birds as a one on the Beeble Scale (will definitely see again, most likely in the next set), explicitly acknowledging their ubiquity