In the simplest terms, the symbol tells you the set, and its placement next to a rarity icon tells you how common that specific card is within that set
Perhaps the main reason Rare Candy represents strong card design is that its an integral part of the Pokmon TCG
By forcing creatures to block it, youll also be able to force players to sacrifice their creatures thanks to The Rings temptation gained by playing legendaries
Take everything great Ive said about Raff, Weatherlight Captain allowing you to play the game at instant speed, and all the benefits of Elminsters cost reduction and staple them to the backside of this card
From there, simply cast Thassas Oracle and win the game
Traverse the Ulvenwald is the prize for playing this strategy, and the one-mana sorcery is a perfect build around card