Sandstone Citadel

While Sandstone Citadel is on the battlefield, when you manufacture, you may instead choose to create another 0/0 Construct Army token, put +1/+1 counters equal to its manufacture number, for a max of two Construct Army tokens.
{t}: Add {e} to your mana pool.
If you would lose unspent mana, that mana becomes energy instead.