This is another great way to learn the game between tutorials and always having someone to play with
They carry the SR designation and represent the strongest, most competitive-demand cards in any given set
While its symmetrical effect is typically seen as a downside compared to Doubling Season, you should instead use its presence on the field to your political advantage: Dont remove me from the game, youre getting value off of my Primal Vigor, Wait, I can cast Primal Vigor next turn and we can swing in with all those Tempt with Vengeance tokens, etc
Chances are, if there's 20 1/1 Goblins on the board, and 10 other big scary creatures, you'll only be leaving a puny gobbo on the battlefield
Expansions You can always check out how much of a certain set youve accumulated by selecting that specific set
This is one of the edge cases where poisonous is slightly better since you can have multiple instances of poisonous triggers that stack