You have access to a host of Wizards to double damage from, including Black Waltz No
In that sense, it feels like a much-improved version of Spider-Punk that offers a similar anti-control role but with broader protection and more immediate impact
Rikku also comes with an activated ability that lets you Steal opposing counters, and her ability to make a creature that gains a counter unblockable for a turn works very nicely alongside Tiduss proliferate trigger
For example, Naya Hexproof is becoming quite popular, so cards such as Celestial Flare might be good to consider in the sideboard, and Golgari and Junk Dredge is showing some play in tournaments as well, meaning Scavenging Ooze could also be another adaptation in the future
Even without Ms
It gains +1/+1 counters equal to the colors of each spell you cast, and you can remove five counters to produce a burst of 10 mana in all colors