This is really, really weak. "You may play an Action card from your hand" is essentially the same as +1 Action. So, let's assess what it does for each combination of the bonuses that any card can give:
The played card has...
+Cards: Premier is a Necropolis.
+Actions: Premier is a Cantrip. That does nothing else.
+Buys: Premier is a Copper.
+: Premier is +1 Action, +1 Buy (strictly worse than several
cost cards).
+Cards and
+Actions: Premier is a Village.
+Cards and
+Buys: Premier is a this-turn only Fishing Village. Which is strictly worse than Squire.
+Cards and
+: Premier is +2 Actions, +1 Buy. Which is strictly worse than one of my thoroughly playtested
cards.
+Actions and
+Buys: Premier is a Peddler.
+Actions and
+: Premier is a Market Square sans reaction.
+Buys and
+: Premier is a CSM but with +
instead of +1 Coffer. Almost always worse than CSM.
+Cards,
+Actions, and
+Buys: Premier is a Bazaar.
+Cards,
+Actions, and
+: Premier is a Worker's Village.
+Cards,
+Buys, and
+: Premier is a Villa sans on-gain effect.
+Actions,
+Buys, and
+: Premier is a Market.
All four: Premier is a Market with +1 Action on top.
As shown above, the only time Premier is at all worth
is when it plays something that gives both Actions and Buys, or something that gives all but one of the vanilla bonuses, and those cards are few and far between. Premier is completely outclassed by Throne Room at the same price the overwhelming majority of the time.