Kyoki, Sanitys Eclipse Kyoki, Sanity's Eclipse is a spirit/arcane-focused black commander, but that feels like something that belongs to the Standard format of its time
That's probably why WotC leaned towards Treasure: Gold allows you to double-dip in case some other effect requires you to tap permanents (because you can tap your Gold to pay for that other effect, and then still sacrifice the Gold for mana in the same turn)
Idle Thoughts gets a much lower position than those other cards because blue specifically has a ton of other (and better) card draw engines
I've also increased the amount of interaction in the deck, with an emphasis on instant speed and/or cheap interaction
Still, some are drastically more expensive than others, or hard to get hold of after limited print runs
Wayfarer's Bauble, Myriad Landscape get those extra lands on the field