While the goal is to take all six, sometimes strategically leaving certain Prize Cards for later can be beneficial
CORI-JP045 Konton no Magic Box / Mystic Box of Chaos Quick-Play Spell (1) When your opponent activates a card or effect that targets another card(s) you control: Return 1 of those cards you control to the hand (if Set, reveal it), and if you do, destroy 1 card on the field, then you can Special Summon 1 monster that mentions Ritual of Light and Darkness from your hand, with a different name from the returned card, ignoring its Summoning conditions
I'm honestly not sure if Radiant Fountain is worthwhile or not
There is an artifact sub-theme to go along with the counters, which also supports the overall counter strategy
The build would look a little different, with more attention paid to comboing with Aurelia (using any of the near twenty combos available, including those that flicker her using Sword of Hearth and Home/Ephemerate
Numot, the Devastator brings land destruction, an unpopular strategy, but a fine Dragon overall