Yo rooster !
Ho-oh EX is a playable card in the current format, which means it will be worth more than an EX that isn't playable.
Ho-oh EX full art would be around £14-20 (22-31 USD.)
You can build a deck around Ho-oh EX using Mewtwo EX and other attackers since the rebirth ability is pretty neat !
Use rebirth get 3 energies on the Ho-oh EX, then use energy switch to move the energy around to your other attackers ! So in a sense, Ho-oh is the support Pokemon on the deck which gives you the energy acceleration.