Considering several alternate abilities for this, as I couldn't figure out a way to balance what it currently does, in light of Phoenix. None of the following would require a creature sacrifice.
1. Intensity: all spells deal 1 extra damage. Works well with Fire, although in Lance decks Fahrenheit would still be more practical, as it deals more damage in the long run. Damage for Fire Bolt, Ice Bolt, and Drain Life would be +1 on the
first bolt only, to prevent abuse by Lance decks. Only problem is that it doesn't make much sense for a fiery blade to boost an icy spell. DOES boost Unstable Gas, both against a player and creatures; this would boost Air/Fire combos.
2. Torch: all friendly creatures gain +2|0 for one turn, but take 1 damage. A one-shot temporary Field Acceleration. Fire creatures already have low HP (except grown Golems), so there's some inherent balance... the damage would be permanent, but the increase would be to the
current attack stat, not maximum - it will reset at the end of the turn like Dive or Sky Blitz. Because the damage is dealt immediately, a creature with less than 2 HP remaining, like a Phoenix, would just be killed. This may even work with a Fire ability cost, instead of duo. Stackable with flown or endowed Summers.
3. Ignite: may destroy inflammable shields instead of dealing damage. Similar to Winter, but with a permanent effect with a lower chance to strike. Yes, it is renewable PC for Fire... but it's limited to the opponent's shield slot only. Certain shields are immune; if the shield is immune or there's no shield, Summer will always just deal damage. Here's a list of shields that would have, say, a 10-20% chance to be destroyed:
- Solar Shield
- Dusk Shield
- Thorn Carapace
- Skull Shield (Bone Wall loses one point no matter how you slice it anyway)
- Ice Shield
- Fog Shield (Summer is not ranged, so not Wings)
- Gravity Shield (little point though, as Fire creatures usually ignore it)
- Procrastination
Because of the fact that this list is rather short and contains no immaterial shields, the raw damage of Summer would be increased to probably 7|8. Protect Artifact is ignored for shields on this list.
I like all three of these ideas - I am reserving the ones I don't use, to make other cards out of them! Don't go idea-theftin' me, now.