Artificers Bauble

Sunburst
{t}, Remove a charge counter from Artificers
Bauble: Add one mana of any color to your mana
pool.

{x}{x}, {t}, Sacrifice Artificers Bauble and another
artifact you control: Search your library for an
artifact with mana cost less than or equal to X. Put
that artifact onto the battlefield. This ability cost is
reduced by {1} for each charge counter on this
permanent.