The Alpha one has a good home in Canada
It costs only 4 mana, it can go into every deck that has a commander with a relevant trigger (which they often do), and if you build a typal strategy, this artifact creature can help you even further
It will not overwrite effects that modify power or toughness (whether from a static ability, counters, or a resolved spell or ability), nor will it overwrite effects that set power and toughness which come into existence after the ability resolves
The Petrifier is a nice addition to a minotaur deck, but it doesnt have much value outside of that
All those cards can be used, except Link Monsters and Pendulum Monsters
Don't miss this opportunity to own a piece of Yu-Gi-Oh