Plargg and Nassari

The joke of the Book Devouring duo is that they turn a shared upkeep dig into a negotiation. Each player exiles cards off the top until they hit a nonland, then an opponent gets to veto one of the cards flipped this way: whatever they think helps you most, they hand to nobody. What survives that veto you cast free, up to two spells at once. The politics are the whole engine. Heads-up, the veto is a clean tax on your best hit; at a wider table it becomes a game of chicken, because the opponent who chooses is deciding which of the revealed bombs to deny and, implicitly, which to let resolve. That asymmetry is the design: the card wants a table broad enough that nobody can afford to hand you the best card, so they collude around the second-best and you still cast free spells every turn. The exile also strips the top of everyone's library, so an alert group reads the whole board state before deciding. The 5/4 body is fast enough to matter but this is not a beater; it is a repeatable free-cast advantage engine dressed up as a mandatory group-hug moment that never actually hugs. And because everything the trigger touches goes to exile rather than the graveyard, there is no recursion payoff hiding underneath: the reward is the cast itself, which pushes deckbuilding toward density, enough live hits that the opponent's denial can never find a dead turn.