It's handy for combo strategies, builds your Storm count, pumps Prowess creatures, puts an Instant into the graveyard to get you towards Delirium or enlarge a Tarmogoyf, and gets you closer to Threshold or pays for Delve costs And sometimes you would rather have cards on top of your deck than in your hand
Gemhide Sliver is an essential card for any Sliver-themed Commander deck, giving you all the mana you could possibly need or want, assuming you have a few Slivers out as well
The Future rare cards will likely still be disliked by some, but at least most people agree on one thing: TPC needs to do away with the Pikachu head it plasters on every special set.
If you want a casual Aurelia deck capable of taking a bunch of extra combats, I have a sample list you can try out on Moxfield
You can download, however follow these rules: 1
Aether Gale