Were still going to cover them here (loosely ranked from worst to best) so you know the best playable options available, but given the opportunity, leaning on another color and/or mana rocks when possible will usually yield better results outside of specific strategies
Counter your opponents spell, copy your Dowser and get back your Sublime Epiphany
your opponents could just try to remove Octavia to ease the pressure, but it still comes at an extremely steep cost
While you dont want to help your opponents, you can make sure to stay ahead by having a five-cost character sing the card for free, leaving your ink open to cast those new cards you just drew.
T&N is still a reliable way to convert nine mana into a win, but check out Wilds of Eldraine's Thunderous Debut if you're searching for an even cheaper, albeit slightly worse version
Third, the escalate cost of discarding a card can actually be used to our advantage with cards like Scrapheap Scrounger or Prized Amalgam