If you do care about winning, though, and find yourself channeling your inner Vegeta as your attacks barely cause a scratch, then consider adding some ways to circumvent that annoying interaction before you flip a table
Despite this drawback, however, Scion of Oona is definitely still worth playing and including within the 99
But I love Frantic Scapegoat by Jesper Ejsing the most
5C mana-fixing rocks like Chromatic Lantern, Fellwar Stone, and Coalition Relic are perfect here, but even the signet cycle (Golgari Signet) and the talisman cycle (Talisman of Creativity) do a great job here
Whichever you choose, you'll still be getting a 10 mana 7/7 (plus a number of +1/+1 counters equal to the highest mana value of cards in exile) with annihilator x equal to the number of counters and ward that exiles half of your opponent's library
At this point, pretty much nothing is off limits for Magic: The Gatherings Universes Beyond initiative