The Asus ZenFone AR is a Daydream-ready mobile phone. This means that the phone is compatible with the Daydream View VR headset, it's optimized to deliver a great mobile VR experience as Google planned for it to do and it's compatible with all the Daydream apps and games. There aren't many Daydream games right now, but there are quite a few good ones. 2016 was pretty weak for Daydream, but we also need to consider that this was just a start and in 2017 we can expect to see many more game and apps as more Daydream-ready smartphones like the ZenFone AR being released.
Developers are waiting for more devices to be released because as for now, not so many people own such devices, thus the targeted audience that those apps are targeted for is very limited - but all of this will change in 2017. The Asus ZenFone AR is yet another Daydream VR smartphone that joins the limited yet growing list of device, including the Google Pixel and Pixel XL, Motoroloa Moto Z, Huawei Mate 9 and Nexus 6P that was used for building and testing Daydream apps when the platform was first launch and when there were still no supporting handsets for it.
The Asus ZenFone AR by itself can't provide you wit ha VR experience, you have to buy the Daydream View VR headset, which is as of the time of writing, the only Daydream compatible headset available on the market (more will come in 2017, hopefully in CES 2017). I also don't know yet whether you'll get the headset as part of a bundle for a cheaper price or even for free. I assume that it will be sold separately. The headset itself, as of the time of writing, cost approx. $79 via bestbuy.com, Verizon and Google Store but I've seen in on amazon.com for $113 (no idea why it's more expensive there). I am saying that because you might need to consider the added cost in order to enjoy VR.
The are more than 60 titles available for Google Daydream. Some of my favorites are: The Arcslinger (stationary first-person shooter), LEGO Brickheadz (a tabletop puzzle), EVE Gunjack 2: End of Shift (first-person space shooter), Danger Goat (puzzle platformer) and the gorgeous Affected: The Manor (first-person horror game). Anyways, if you buy the ZenFone AR and searching for VR games to download, just visit vrgamesfor.com, they have an extensive least of all the available Daydream games with description, videos and even rating - really cool site.
There are probably going to be more Daydream-ready phones that will be announced in CES 2017, but keep in mind that this phone support both Google Tango and Daydream, not just Daydream VR.