Wild magic sorcerer variant: astro-mage

As much as the idea of the wild magic sorcerer really got me excited when I read the 5E PHB, I found the D100 list of Random effects to be not quite what I was looking for. I'm not sure if it was just not quite thematic enough for me or if some of the effects were just too off-the-wall. So when one of my players chose the class I made up a d100 list of my own themed around a fantasy zodiac. The idea was that the caster is born under a particular astrological sign which allows them access at random times to bursts of cosmic energy. There are ten signs each with ten effects which are as follows:

The Ram

1,2, glowing horns appear on your head for d6 rounds doing d10+2 bludgeoning damage, attack with proficiency 

3,4, you can see invisible creatures for 10 minutes 

5,6, a bright light shines out from your mouth in a 20' cone doing 3d6 radiant damage, save for half 

7,8,9, you hear a deafening rumble of hooves, everyone save versus thunder or take d10+caster level damage 

10, A star appears in your hand throw it at an enemy to blind them, range 80'

The Fence

11,12, for the next minute at a wall of smoke pops up around you to block any magical attack

13,14, you find yourself able to speak and understand any language for one hour

15,16, healing surge, 5 hp regain for 5 rounds

17,18,19, advantage on saving throws against spells, manifested through a twinkle in the eye

20, you are able to imbue an Ally with advantage on saving throws for three rounds

The Boat

21,22, Time seems to slow down, double your move speed

23,24, all your spells with a casting time of one action become bonus actions

25,26, teleport up to 60 feet provided you can see the destination

27,28,29, you become a fluid like water, interpret this as you will

30,  you become immune to poison, fire, cold and lightning for 10 minutes

The Beast

31,32, you appear to grow fangs, your next hit is a crit 

33,34, take advantage on strength-based ability checks for 10 minutes

35,36, your voice takes on a demonic Growl [advantage on intimidation]

37,38,39, you grow a barbed tail which does 2d6 piercing damage , Save versus poison

40, A shaggy Fox with unaturally long legs and glowing eyes does your bidding [speed 40, bite +5, D8 damage, eight HP]

The Sage

The Crown

The Tree

The Jug

The Mountain

The Serpent 

Exhausting magic

I think one of the most intriguing mechanical elements of 5e is the "levels of exhaustion". I have yet to use it in game but I think it would make a very interesting story driver/consequence engine. It adds granularity to damage in a way that hit points don't. Something else I have been pondering is how one might add some grittiness to the magic system and I came up with a way to showcase levels of exhaustion while adding some risk to using magic. taking inspiration from the wild magic of the sorcerer class, what if whenever a magic user had a crit fail he or she gained a level of exhaustion? Now a lot of magic doesn't use a direct attack roll and is just save versus spell, in which case the exhausting magic might not apply. alternatively if the target of the spell Crits their save maybe the spell bounces back up on the caster? These house rules might go nicely in a higher danger setting with the permanent disability rule in effect. The key would be finding a balance where the added risks don't make the lethality unplayable. Perhaps it would be fun to try in a higher level one-shot where the power balance is purported to swing in the players favour. My literary proof text for this idea, btw, is in A Wizard of Earthsea when Ged over exerts his ability and is blinded for several weeks.