Rikku will fit right in on curve in many decks that care about counters
When I first started, I created a list of keywords that would refresh my memory on what each ability did at a glance (nothing slows down a game like Googling a phrase every turn)
If only red had access to some number of cards which said creatures cant block this turn, or if the Commander format had a history of developing tech to efficiently defend creatures from spot removal would that make Breath of Fury a premiere game-ending spell
Although Yuna, Hope Of Spira is another excellent card for the iconic character, it falls over a hundred dollars short of the more elusive Grand Summoner
Commander's Sphere is also widely popular for similar reasons: You ramp and fix mana with this rock, and draw a card when needed (for 0 mana, even if tapped out!)
Toski is next best costing just four but for just a 1/1 body but with indestructible to stay alive, and then it cannot be countered either