Believe me, the extra time was helpful in hindsight
The Ring's emblem of temptation relies on players having good creatures that can attack effectively without being killed by blockers too easily, so the effect may be better used by creature-heavy decks that are already adept at pushing damage, or even control decks that can attack with a single, evasive creature to close out the game
It costs mana to activate, but its also a 1-drop and much less restrictive than Knight of the Reliquary, so it has some advantages that the Selesnya card doesnt have
If you cast a spell for another cost "rather than pay" its mana cost, you can't choose to cast it for any other alternative cost
Oracle gets away with not only being a 4 drop ramp effect but also a weak Exploration because she is self contained and a source of ongoing card advantage
For six mana you get an enchantment that has you swap control of Conjured Currency with a permanent that you neither own nor control