Articuno is a whole lot better than people are giving it credit for. Remember the Mustard Stance cards that require you to have 0 cards in hand other than them? Well, Articuno just opened up a whole world of possibilities for those turn 1 plays. Also, the draw 1 is pretty nice because you can Primate Wisdom something to be drawn with the ability. I’m most hyped about building turn 1 Stance decks with these new additions.
Also, you want the cards to be balanced enough in Expanded. Discarding cards is nothing with Propagation in format so drawing more than 1 would’ve been really too much.