Archmage:
Mythic Spells: At 2nd tier, you can select one mythic spell (see Chapter 3) and can expend your mythic power to cast that spell with enhanced results. You must have the normal arcane version of the spell in your spellbook or on your list of spells known. At 4th tier and every 2 tiers thereafter, you can select another mythic spell.
Heirophant:
Mythic Spells: At 2nd tier, you can select one mythic spell (see Chapter 3) and can expend your mythic power to cast that spell with enhanced results. You must be able to cast the normal divine version of the spell or have it on your list of spells known. At 4th tier and every two tiers thereafter, you can select another mythic spell.
Both essentially grant only 5 potential Mythic spells as a base ability for their path.
Mythic Spells (Mythic)
You have learned how to unlock the power of your spells, combining them with your mythic power.
Prerequisite: Ability to cast spells, 1st mythic tier.
Benefit: Select a number of spells equal to your mythic tier. They must have mythic enhancements and be on your list of spells known or in your spellbook. You can now use your mythic power when casting these spells. Whenever you gain a mythic tier, select a new spell to add to this list.
Special: You can select this feat multiple times. Each time you select this feat, you must select different spells.
At just one selection, the feat potentially gives you 10 Mythic spells. You can take it at any Mythic Tier, if the prereq is the minimum as it is in most feats. it doesn't say 1st tier only, plainly alludes to using another number other than one as the number of spells you get to choose from the Mythic spell effects list.
If you take it again, at gaining any odd Mythic tier later, you have the potential of acquiring 10 more.
Even for the playtest adventure, taking Mythic Spells Feat at MT1 grants the first spell. Only one at this time, boohoo. The wizard goes Archmage. Then you gain MT2... Archmage path ability kicks in and you now get a second spell. But wait...! The feat gives you a third Mythic spell because it gives you one at each Mythic Tier gained. Looking hawt.
Here comes MT3: you get one from your first for a total of four Mythic spells, and then pick Mythic Spells again as your 3rd tier feat, giving you... get this... 3 more spells... for a total of 7 Mythic spells.
Awesome sauce on this awesome cake... nowhere yet does it say you absolutely have to have the spell selected as one of your daily allocation as a prepared caster or a spell slot available as a spontaneous caster. The Archmage ability Wild Arcana lets you burn a Mythic Power Point to cast any spell you know and apply any metamagic feat that you know to it. The unlocked Mythic version is a metamagic effect is it not? Metamagic feats are those designed to alter the function of spells in some way, in this case Mythically and without a level adjustement. So...
If the wizard, Elfrond, with his Int at 20 at 1st level puts his 4th level ability bonus into Int (like a good little wizard that he better be), and gets Int-21. That's a +5 Int Modifier, no real change.. Some short time later, he ascends and gets his first Mythic tier and takes Mythic Spells as his MT1 feat, Archmage as his path, Wild Arcana as his chosen schtick, and (of course) chooses Intelligence as his Mythic Power feed-stat. This makes his Mythic Power point total to 6. Life continues on with its trials and, Lo!, we get to MT2 just after making level 5 ( just for giggles). Now we get the Mythic path ability for Mythic spellls. The MT2 ability score increase boosts him to Int 23 and now his modifier is +6 and his power pool is now 8. Hitting level 8 will up his Int to 24 (Int mod-+7) and his pool to 9.
He prepares his spells as normal. Its a real hard day and he realizes that a couple of his spells just aren't going to be useful for taking out the overly muscled, smells like Mythic sweat brigand leader. He burns a Mythic point to access Magic Missile, a spell he has on his Mythic Spells list and applies the Mythic feats to it. Now we got ourselves something worthy of burning brigand backside. Scorching Ray is also on his list, so He spam casts them at the BBEG until he falls over, especially since he's got his Guardian and Champion friends doing that bang up job of keeping his squishiness form getting squished.
Elfrond, at level 5ish, with just 2 teirs into Archmage, can cast all of his spells and then get up to 8 more castings of kick-ass spells in a single day. Recuperation at MT3 just makes this even better when he gets to rest an hour and replenishes all is used Spells per day slots to be filled with more universe twisting goodness.
That, my friends, is a Mythic spellcaster in the making.
I think any Archmage or Heirophant would be a fool not to take the feat at MT1. If he loves the choices of spells (which are decidedly few right now), he might take it again at MT3, because we do have few really good Mythic feats to choose from.
The only possible downside is running out of spells that currently have Mythic enhancements that you can cast as a normal spell due to spells known or learned deficiencies. As with a huge percentage of the Mythic rules, that all depends on the Path Master being fair minded and having the doors open for advancement.
I can see a rewording in the future to make it so that only the spells on you prepared for the day list or to be used in the available spell slot can be used as Mythic Spells, and so that Wild Arcana could not trigger the Mythic spells without at least costing 2 points first ( one for the Wild Arcana activation and then another for the Mythic Spell enhancement), but right now, they don't have any such wording.
