Yeah, I dunno about Shards in AI1. I've only played a handful of games there except for maybe tweaking a deck and being too lazy to open the trainer.
A few things to consider:
You only get 1 spin from AI1
Since AI1 is "random", there's less chance to have multiples of a card.
Don't know if anyone's done a drop-rate study on AI1, but I guess if your bored... well, there ya go...
have fun...
You'd prolly have better luck going into Plat with a 30 Pillar Deck and an Oracle pet and running across a 1hp deck than farming AI1...