you can use myr matrix for infinate mana?

Indestructible (Effects that say "destroy" don't destroy this artifact.) Myr creatures get +1/+1. : Create a 1/1 colorless Myr artifact creature token.

Tap two untapped artifacts you control: Untap target artifact.

, : Double the amount of each type of unspent mana you have.

At the beginning of each player's first main phase, if this artifact is untapped, that player adds for each artifact they control.