You can learn a number of mythic spells equal to your tier and can expend mythic power when casting them to enhance the results.
and Wild Arcana when leveling mythic.
As a swift action, you can expend one use of mythic power to cast any one arcane spell without expending a prepared spell or spell slot. The spell must be on one of your arcane class spell lists and must be of a level that you can cast with that arcane spellcasting class.
Would it be possible to cast Mythic Haste with Wild Arcana? Wild Arcana explicit says that a swift action is necessary. Do I need a second one to use Mythic Spell Lore? The text only says "expend mythic power" but do not state that this is an action.