You sacrifice the artifact only if you still control it at the beginning of the next end step
There are some niggles here with trigger ordering that I haven't investigated fully, but so far my informal play procedures have been sufficient for a few quick playtest games.
Mana sources that produce more than they cost: Mox Diamond, Chrome Mox, Mana Vault, Grim Monolith, Ancient Tomb, Lion's Eye Diamond
While this can be desirable in some archetypes others prefer to leave their graveyards intact, indeed some archetypes such as reanimator not only want to keep their graveyards in place but can make use of the discard aspect of Wheel
Its proliferate ability synergizes well with a lot of strategies, from planeswalkers to +1/+1 and poison counters to sagas
You can divide card sleeves into two main categories: outer and inner