Some Enchantments are Auras, which have to be cast on another permanent, to alter it in some way
Though tappers are just useful cards to have around, the support of stun counters and consistency of it's effects make it a legitimate archetype to build decks around
While you may want to just attack with your creatures, it does give them a form of haste that can generate value
When MTG publisher Wizards of the Coast began officially supporting the EDH format back in 2011, potential issues with intellectual property infringement were avoided by changing its name and Commander was born
For example, cards like Nullrune, which can permanently remove non-attack action cards, might provide more consistent value
The webmaster over at OriginalMagicArt.com, Joshua Krause, has offered to host a listing of the Alpha playtest cards