Dishonourable Mentions Fable of the Mirror-Breaker I love Kiki-Jiki
You can argue that mana is the most important resource in Magic, so getting more of it is one of the best game actions you can take
With her ability to drastically reduce Song costs, she frees up your inkwell for other actions
The biggest problem most direct damage players face right now is that so many of the cards that dish out the damage cant be inked, and theres nothing worse than finding yourself with a handful of uninkable cards, slowly falling behind your opponent in the resource game
The problem with the card is that you really need to build around it to make it work for you however there is not enough redundancy in the effect to make that reliable enough
What's more, if you don't like the cards you put back on top, it's trivially easy to find an effect to shuffle way them away