You could also do it as a Treasure, so you wouldn't need two different effects. Something like this:
Falcon (Treasure) $3
Worth $1
+1 Action
When you play this, return to your Action phase.
Ew, returning to your action phase? No thanks.
Why do people dislike the 'return to your action phase' concept?
It could lead to some nasty tricks with Horn of Plenty (draw and play your deck except for a Smithy, play HoP to get new cards (topdecking them with Watchtower or Royal Seal), draw them with Smithy, then you're off to the races again), Mandarin (gain a Mandarin when you return to your Action phase, then re-draw all your Treasures so that you can play them again), and others.
But more importantly, once someone has played their Treasures, I normally know that I can start preparing for my next turn. Sure, they might still hit me with IGG or something, and of course there's Mission/Outpost/Possession, but ordinarily, the Buy and Cleanup phases are a transitional period between two players' turns. 'Return to your Action Phase' dispenses with this psychological transitional phase.