White can draw cards from lifegain in various ways, but I personally shy away from Well of Lost Dreams and Dawn of Hope these days due to the heavy mana sink required to draw cards, and the inflexibility of when that mana is required
A white aggro/token deck with E
Ancestral Visions is a lovely little card, the drawback perfectly balanced to make it fair, flavourful and widely playable
On the Maguss plus side, if your opponents removal doesnt use red mana and they dont have the color they need, the card will stay in play for some time
Some people give them away to new players or use them to make tokens or proxies
That said, the rewards in AI battles flow constantly, so you wont need to fight in PvP to advance if youre not a competitive player