Spectral Sliver

Slivers turn one member's trick into a hive-wide entitlement, and what this one shares out is the most fundamental upgrade there is: a repeatable, self-contained pump every Sliver on the board can fire as long as mana holds. The grant is the point. A single copy hands a : +1/+1 activation to the whole team, so a stalled ground of small bodies each gains the option to grow into a real threat, and the more Slivers you control, the more outlets leftover mana finds. The creature itself is incidental; what matters is that the tribe's defining mechanic, collective abilities any member can use, here aims squarely at damage output, the resource a wide Sliver board most often runs short on once combat gums up. Because the granted ability carries no tap symbol and no once-per-turn cap, you can stack it as deep as your mana allows, across as many Slivers as you like: thin the activations across the whole battlefield to lift every body incrementally, or pour everything into one unblocked attacker and convert a single Sliver into a finisher. Where other Slivers in the canon distribute evasion or keywords, this one distributes the closer: the conversion rate from idle mana to combat damage that lets a board too clogged to win actually win.