As far as this reprint goes, Im a huge fan of the new art by Alayna Danner and the flavor text because they really help Reflecting Pool fit into the Baldurs Gate setting
Once the Level 2 and Level 3 costs are paid, those abilities are active for as long as you control the enchantment
Mono-black ramp packages should be built around the Coffers engine: Cabal Coffers, Urborg, and 2-3 Swamp-scaling payoffs like Crypt Ghast and Magus of the Coffers
Likewise, foils are going to start very, very high, and retrace only 30-40% as peak supply rolls through
If you do, untap all attacking creatures and after this phase, there is an additional combat phase
He immediately makes up for that by returning 2 cards from the inkwell to the player's hand, however, and can keep generating value as a great card for questing