Coins, crystals and ship shards
Once every day, the Omamori Gacha is a long-term banner than lets you roll for free. This banner can net you a range things, from coins, crystals, all the way to pilot and ship fragments. The Coin Gacha is another irreversible banner that also lets you roll free daily. This one nevertheless just has coins as a payment, however is still actually handy. Make sure to roll on these banners every day!