Since it's an instant you can do it at the end of your turn
Reset back to where you were and whoever losing halving their remaining life. It also mentions Ante which is gone, but was something that actually had you betting cards
But when the condition clashes with your gameplan, it poses the question: Is it more beneficial to advance your own board, or prevent an opponent from claiming the Bounty
They play a sixth land and attack you
If you can give it Trample or some kind of evasion, then maybe we have a combo card on our hands, but thats a lot of extra work to make this more than just a solid, average creature
If you are mostly playing green decks, then it may not be necessary to have many counters, but less if you use black ones