how to tell a pokemon cards rarity Card Cheat Sheet Rarity - Bulbapedia, the community-driven

Rares (R) are the showstoppers, featuring powerful, game-defining effects

Each Collector Booster contains the following: 15 Magic: The Gathering cards 4 Traditional foil commons From among 81 commons and 10 common two-color lands 3 Traditional foil uncommons From among 100 uncommons 1 Non-foil common or uncommon showcase draconic frame card This can be 1 of 6 commons (54.6%) or 15 uncommons (45.4%)

1 Selesnya Sanctuary

(2014-07-18) If enough -1/-1 counters are put on Chasm Skulker at the same time to make its toughness 0 or less, the number of +1/+1 counters on it before it got any -1/-1 counters will be used to determine how many Squid tokens you get

Its cheap mana value and activation cost make it a great surprise play when your board already has targets for it like Jazal Goldmane