Doubling Season exists in a Standard format that starts with oil counters and poison counters, but what kind of counters do you think well be doubling by the time this rotates back out
Until next time, may your packs always contain Ragavan, Nimble Pilferer, and the slickest foils
What could it be
If you do, this creature gets +X/+0 until end of turn and deals X damage to the player or planeswalker its attacking
For one more ink, you get +1 to her Strength and Willpower and, more importantly, one more lore
(The exact restrictions are more specific, but thats the general idea.) Other formats, such as Modern and Legacy, dont rotate at all, meaning the pool of cards that you can choose from grows with each new set release