Cards like Sun Titan are ideal for this plan, as you can use them to accrue significant value over time through creatures like Eternal Witness, Loyal Retainers, and Wood Elves, fetchlands like Bloodstained Mire, or even previously destroyed mana rocks, so having a big creature or two that can fill this role is very helpful when possible
This site isnt Magic-specific, but it provides a wide range of paper options, foil features, and other print settings
As written, exhaust abilities are abilities that can only be activated once per game, meaning once they are used, that's it, unless the card is recast at a later point in the game
That's the reason for the discrepancy
This general ability has been seen many times before on other cards, but always with stipulations which You Came Back does not have
Building a deck around her could go just about any way, from your typical Group Hug strategy, to mill, to general Storm, or even the route of aggro