Scuttling Sliver

The untap grant is the quietest of the Sliver lords, and the one whose value is hardest to feel until the board stops moving. Where most Slivers hand out combat keywords or evasion, this one distributes a repeatable pseudo-vigilance: pay two, untap, and a creature that attacked is back on defense, or a tapped Sliver with a useful activated ability comes online again. The real leverage is on Slivers that tap themselves as part of their function. Any Sliver whose ability requires tapping can be run twice in a turn once every creature can pay to stand back up, which turns a table of tap-abilities into a mana-gated engine rather than a once-per-turn cadence. It asks nothing of the board state and everything of your mana; the ability is deliberately open-ended, so the ceiling scales with how many other Slivers are already doing work and how much floating mana the deck can generate. Left to fight alone, the 2/2 body does little; its job is to make the rest of the hive harder to grind down, feeding the slow, incremental attrition the tribe was designed to win.