Regal Sliver

Grafting the monarch subgame onto the Sliver hive is the whole trick here, and it forces the tribe into a decision loop it rarely faces: every Sliver you cast becomes a monarch check. If you don't hold the crown, the next Sliver to enter claims it; once you do hold it, each subsequent entrance instead pumps the team +1/+1 until end of turn. That splits the payoff along a fault line most Sliver builds never have to defend. The crown grants its flat one card at your end step regardless of how wide you are, and that end-step draw is the sustained engine; the anthem is the part that scales with entrances, but only while you sit monarch and only for the turn. So the deck's tempo pivots on who currently wears the crown, and the moment an opponent seizes it, your next Sliver hands you the throne back rather than the combat boost. What keeps this from pure upside is exactly that contingency: the anthem is fleeting and gated behind holding a subgame Sliver decks are not constructed to protect. It reads as a targeted answer to the tribe's late-game flood problem, where the swarm stalls once the curve is spent and no new threats are landing. Rather than a flat stat lord, it trades the anthem convention for a resource loop that rewards the same wide, entrance-heavy board the tribe already builds toward.