Since Sands of Times trigger will untap both artifacts and lands, each trigger will reset your copying artifact, while giving you the mana to activate it
Right now, its unclear which one of these camps is correct, and we may only get an answer if, or when, the market pops
Coram, the Undertaker Coram, the Undertaker is a power-matters commander ideal for decks that heavily utilize the graveyard
Arcane Denial also tends to provide you with a tempo edge, not only is the card cheap and therefore usually answering something of greater cost but it also tends to let you untap and use the card drawn from it before your opponent
Did it not push hard enough, then they were usually Grey stamps like the one above