How many times can i use grenades, hologram? once or more?

So you play the grenade card as an Action, which stays in play, and the grenade token goes on the map wherever you aimed it. For Frag and Siphon, they stay until the end of the Round (not turn, round) and then detonate, dealing their damage. Then the token returns to you and the card leaves play and goes into discard. For Hologram, instead the grenade token stays out until it's killed (takes 3 damage), and then it returns and the card goes into discard. Then, once your deck runs out of cards, and you shuffle your discard back into a deck, you can play the grenade card again after you draw it again.

thanks:)