PureSteel Monolith

Indestructible
{t}: Add a Mana of the color of your choice to your Mana pool. If this Mana is used to activate an Artifact ability, put a Steel counter on PureSteel Monolith.
{2}: Move a Steel counter from PureSteel Monolith to target Artifact creature you control: that counter grants +1/+1 to that creature.
"The Immortal told us his masters used this to build, then destroy their civilization. You should be careful"
-Nalia, to Velion