The Argent Hive

Sliver spells you play cost {1} less to cast.
Whenever a Sliver creature comes into play under your control, place a charge counter on The Argent Hive.
{t}, Remove a number of charge counters from The Argent Hive: Activate one of the following effects:
3: Place a +1/+1 counter on up to two Sliver creatures you control.
6: Put a token into play that is a copy of target Sliver artifact creature you control.
12: Slivers you control have indestructible until the start of your next turn.