The design of the Topsun cards is distinctive, with a large image of the Pokmon [2] on the front
Yes, you lose some life every turn, but The One Ring is also indestructible, making it extremely difficult for your opponents to interact with, and you really should have some bounce spells to maximise the potential of The One Ring (and to not lose too much life)
Eject, Cornered by Black Mages, Ice Magic, and White Auracite are all good examples of cards costed well above comparable spells in other sets
T5 Scar for +1 Strength at the right time and a card draw when necessary
The Return to Ravnica block repeated hybrid's use from the original Ravnica block, a vertical cycle (common, uncommon, and rare) for each of the two-color pairs, five in Return to Ravnica and five in Gatecrash