In the Hall of Eternity, you can find some of the hardest duelists in the game, each of which upon defeat, yields some of the most powerful cards in the game, along with a massive (by this games standards) 10-20 increase in Deck Capacity
In decks capable of generating a lot of mana through rituals for example, this sounds very fun and powerful
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It has good synergies with other Pokmon such as Milcery itself, Swirlix and Slurpuff, Vanillite and Vanillish and Appletun, which can use Sweets Relay
The [On Play] effect has already finished activating
Fossil Fusion Type Spell Card Archetype Fossil TCG Date 2020-07-23 OCG Date 2020-06-06 Card Text Fusion Summon 1 "Fossil" Fusion Monster from your Extra Deck, by banishing Fusion Materials listed on it from any GYs (except for materials with a specific GY requirement listed)
