Virulent Sliver

The keyword ability here was a glimpse of where poison was headed: poisonous predated the unified infect mechanic, and this is the design that hands the entire tribe an alternate clock. Slivers had always shared keywords through their hive-mind template, but most of those grants made the team bigger, faster, or harder to block. This one swaps the win condition entirely. Stack a board of Slivers, connect for one combat damage each, and the math to ten poison counters arrives far ahead of the math to zero life, because every body contributes regardless of its power. Granting poisonous 1 to the whole tribe means power on the rest of the team stops dictating the kill: you are no longer adding up damage, you are counting connections, and a 1/1 advances the plan exactly as fast as a 5/5. That reframing turns a deck built to overrun into a deck built to poison, and it does so from a single one-drop body. Because poisonous triggers only on combat damage to a player, the clock still runs through the combat step like any other: lifegain it ignores, but a fog that wipes the damage wipes the counters too, and a blocker that eats a Sliver eats that connection. It is the rare tribal piece that does not amplify the existing plan but replaces it.