If that card's mana value is less than or equal to the sacrificed artifact's mana value, put it onto the battlefield
They aren't going away, obviously, but it's pretty safe to say they didn't come at no cost
[2] Once per turn, when this card is targeted for an attack (Quick Effect): You can inflict 500 damage to your opponent for each Attack Position monster they control, then end the Battle Phase
Prahv, Spires of Order (Azorius) Detain Whenever you cast a spell, Disable your opponents last creature until the beginning of your next turn
For those who remember the U/W Delver days, it took quite a while for that deck to take shape and become fully tuned and I certainly expect nothing different here, but the reward is having a deck that frequently feels like it is playing Modern against Standard decksand I could really use some Modern practice for the upcoming Pro Tour.