Scion of Halaster

The Backgrounds were built as second commanders: enchantments you pair with a "choose a Background" partner to bolt a passive rider onto your command-zone identity. Where most of them touch mana, life, or the board, this one rewrites the first card draw of every turn for your commander creatures in play, converting a blind draw into a two-card look with a mandatory bin. That is card selection dressed as card advantage: you never net a card, but you smooth every opening draw and seed the graveyard with whatever the top card refuses to be right now. The self-mill is the price the filtering pays: one card per turn goes to the yard on your terms. In a deck that wants a stocked graveyard (reanimation, delve, flashback, escape), that self-mill is fuel rather than tax; in a deck that only wants the selection, it is friction accepted willingly. The scope wording is the trap worth spelling out. The ability is a replacement effect on "the first time you would draw a card each turn," so it applies once per commander that carries it; a two-commander partner build does filter twice, since each replacement ends in a new draw the next commander's ability can catch before any card is truly drawn. And because Backgrounds grant abilities only to commander creatures in play, the effect switches off the moment those creatures sit in the command zone. It rewards knowing what your graveyard is worth, and asks nothing of the board beyond keeping a commander on it.