I run these:
Testing, but this idea is to improve white's smoothing. It should be good for control, slower builds of the artifact archetype, and maybe lifegain.
This is pretty strong. It's good in any blue tempo deck, and a payoff-enabler in the tappers deck.
Payoff-enabler for the sacrifice deck. Enabler for the tokens deck. Even outside these decks, it's pretty decent because the tokens can hold off attackers until the demon comes, and though it often gets killed you get quite a bit of value and lower the opponent's tempo in the process.
I run it as an occasional. It's an exciting card, but I moved it to occasionals because blue already has plenty of spells payoffs, and this was wordy and a bit repetitive.