Gift of Flowing Power (Serpent Slumbering Beneath the Island)

If you gain presence during the turn (after Growth) and uncover the "any" or another element, can you then use it for other powers?
Yes, you can start using elements as soon as you gain them. (p. 14) Similarly, if you are able to play a card mid-turn, you get the effects of its Elements immediately.
(And if some effect were to cover an Element by returning Presence to your track, or destroy a Power card in play, you'd immediately lose access to the elements.)
(Discussion elsewhere) Tags: "Any" element, Elements, Adding Presence, Indomitable Claim, 13 more...

When an effect lets you play a card, does that count against your allowed number of card plays?
No. The number of card plays on your Presence track only affects how many cards you can play as part of the "Play and Pay For Power Cards" action in the Spirit Phase. Cards played any other way (usually in the Fast Phase when instructed to do so by a Power) are in addition to those limits.
(Discussion elsewhere) Tags: Playing Power Cards, Spur on with Words of Fire, Unlock the Gates of Deepest Power, Gift of the Primordial Deeps (Serpent Slumbering Beneath the Island), 14 more...

Does an "or" line on a power divide the entire card?
No. The "or" line only applies to the clauses immediately above and below the line, without extra whitespace.
For example, if you use Crops Wither and Fade, you always gain 2 fear and then you may choose whether you are replacing a City or a Town. On the other hand, on Tormenting Rotflies, you either choose everything above the "or" or everything below it.
To be explicit, the following cards have clauses that are not part of the "or" choice (separated by whitespace): Crops Wither and Fade; Growth Through Sacrifice; Sacrosanct Wilderness; Gift of the Primordial Deeps; Gift of Flowing Power; Call to Guard; Vanish Softly Away, Forgotten by All; Thickets Erupt with Every Touch of Breeze
(Discussion elsewhere) Tags: Crops Wither and Fade (Shadows Flicker Like Flame), Growth Through Sacrifice, Sacrosanct Wilderness (Keeper of the Forbidden Wilds), Gift of the Primordial Deeps (Serpent Slumbering Beneath the Island), 15 more...