An Enchantress card is synonymous with drawing cards whenever you cast an enchantment spell, and this subset of cards even got its own commander with the printing of Sythis, Harvests Hand in Modern Horizons 2
Being able to ramp the best land out of the top four cards of your deck at instant speed is already very useful, but the fact that you can still draw one of them into your hand as a fall back means that you wont have a major downside (see Growth Spiral for a similar effect)
Upon arrival, they were given a Masters Key Pokemon card
Official game rules state that Ancient Traits are not Abilities
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Thassa's Oracle is often the win condition for the best Commander decks, being paired with a card like Demonic Consultation that mills your entire deck with one card so that Thassa's Oracle will automatically win you the game when it enters the battlefield