As a white mage, you tend to play cards that imprison or punish your opponents field while gaining life to keep yourself alive and fortify your defenses
They allow you to do things like search your deck, give your Pokemon more attacking power, heal your Pokemon, and other useful things to help you win a game
5 Eloren Wilds This plane takes all your permanents that tap for mana, all your lands, mana dorks, and mana rocks, and increases the amount of mana they add by one, more or less doubling all the mana you would normally produce from spells and instances
Otherwise, your control opponent will overwhelm you with cards and abilities, and pretty soon, youll be the one trying to answer threats, which is never a good sign
It also sees a ton of play in Commander, serving as one of the best cards an Aristocrats deck can run
Salvation Swan is a fixed Restoration Angel, but considering that resto dominated standard during its time, I expect the swan to be at least powerful