Phyrexian Symbiote

Affinity for artifacts
Modular-Sunburst (This enters the battlefield with a +1/+1 counter on it for each color of mana spent to cast it. When it dies, you may put its +1/+1 counters on target artifact creature.)
Infect, Battle cry
Metalcraft - {3}: Scry 2, then proliferate. Activate this ability only if you control three or more artifacts.