At a higher mana cost this might have been a bad card, but as a one mana instant it's good enough to warrant its restriction in Type 1
In Standard, my big concern is Sheoldred, which is really punishing against mass-card-draw effects like this
This particular card has a wicked design and its been going down well with collectors who like character-centric chase cards
If an opponent gains control of your creature and it phases out and the duration of the control-change effect expires before it phases in, that permanent phases in under your control as that opponent's appropriate untap step begins
If the corners are VERY different then you have ALPHA, otherwise you have BETA
Youll actually want a mix of cards that allow you to sacrifice, cards that want to be sacrificed, and sacrifice payoffs