Thalion, the Windwhisperer

Whenever an artifact enters your battlefield, scry 1.

When you control 3 or more Keystone Artifacts, Thalion gets +1/+1 for each Keystone Artifact you control.
When you control 5 or more Keystone Artifacts, Thalion has Indestructible and Hexproof.

{u}{w},{t}: Search your library for a non-creature artifact, reveal it, put it into your hand and shuffle.
{w/u}{2}: Target artifact becomes a Keystone Artifact Creature and gains "This creature gets +1/+1 for each artifact you control."