Amalgamation Sliver

Amalgamation Sliver is every color.
Whenever Amalgamation Sliver or another Sliver enters the battlefield under your control, choose
a kind of counter from among flying, first strike, deathtouch, lifelink, menace, trample, vigilance,
and +1/+1. Put a counter of that kind on Amalgamation Sliver.
Slivers you control have flying as long as Amalgamation Sliver has a flying counter on it.
The same is true for each kind of keyword
counter.