The aura Favorable Destiny is dirt cheap, and provides her with Shroud as long as you control another creature, while the shroud-granting equipment Lightning Greaves and Whispersilk Cloak are more expensive but very useful for any Voltron commander
A stack of sleeved cards is no match for being dropped or smushed around in a backpack
To determine the total cost of a spell, start with the mana cost or alternative cost you're paying (such as a flashback cost), add any cost increases (such as kicker costs), then apply any cost reductions (such as that of The Fire Crystal's first ability)
While theres nothing new about a lands deck (or a Simic value deck, for that matter), Slogurk is a unique commander thats worth a look
Artifact and utility tokens: print the text For Treasures, Clues, Food, Blood, Powerstones, and similar, the whole point is the ability