If you choose not to cast the copy, or you can't cast it (perhaps because there are no legal targets available), the copy will cease to exist the next time state-based actions are performed
Based on the latest market prices tracked on TCG Stacked, a foil copy of One Ring to Rule Them All is worth about $5.18 USD
While this is no Shivan Dragon, there will surely be foreign buyers and other premium collectors that would pay $800
You can use cards like Deadly Tempest and Rakdos Charm to close things out once youre up on life
However, in terms of importance, those should be flipped
This is because there's another Booster Fun version of Okoa borderless versionand in general, our heuristic is to maintain the relative ratios of "Booster Fun versions of Oko" with "Booster Fun versions of other mythic rares." This means that if a card has multiple Booster Fun treatments, you're less likely to open any particular version, but you're just as likely to open a Booster Fun version of Oko as any other card overall