Sliver-Hive Mound

This enters the battlefield tapped unless you
control 2 more slivers on the battlefield.
{t}Add: {g}
{g}{t}: Create a 1/1 green sliver creature token.
{3}{g}{t}: Sacrifice 5 untapped slivers you control; Slivers you control get +3/+3 and gain trample
until end of turn.