Bastion, Flawless Amalgamate

When Bastion, Flawless Amalgamate enters the battlefield, if you didn't play it with The Siege Perilous, exile it.
Bastion, Flawless Amalgamate has every ability
of each sentinel type creature you control.
Other sentinel type creatures you control get
+3/+3 and {2}: Adapt 1. (If this creature has no
+1/+1 counters on it, put a +1/+1 counter on it.)