[Wizard and evo wizard]
need an hp buff similar to witch or hunter. Wizard is really fragile and does not have strong stats for an 5 elixer card, and is overshadowed by other splash cards (goblinstein, firecracker, executioner, evo e drag) and is not used on top ladder. These is no justifible reason to use him, that is, the only thing that make wizard different than other splash cards is his damage per second, however, you can for example use a better alternative, which is a firecracker plus a cannon or firecracker pluso mini pekka, or firecracker plus guards. These combinations give you a lot of damage per second, so there is no need to use wizard for the only thing that distinguish him which is his high damage per second. In addition, wizard is an 5 elixer high investment thag can be taken out easily by spells, unlike the solid executioner and babe dragon. Even if you use evo wizard, players can remove his shield by a zap or cause a slight damage to him (spear goblins hits for example) to remove his sheild and then throw a fireball to take out the wizard. So in summary wizard is not a good card and even with his evo. A slight hp buff to the evo wizard shield wont change how bad the card and its evo is. Wizard is not a good investment, and have all other splash cards that have better good aspects him.
An hp buff to wizard to be in par with hunter or witch is the best option to fix both wizard and its evo. He can then have increased survivability which is his problem. The other option is increase his damage per second (a lot) so he can be at least a useful investment in this aspect (damage) and truly worth his elixer cost, and a solid choice as a splash card compared to other splash cards. An hp buff is the best approach and far better than a damage per second buff approach. Wizard is fragile and have low hitpointd and can be taken out by a fireball plus one hit from ranged troops. So evo wizard should be the opposite, not fragile.
Executioner does not get taken out by fireball plus arrows and have very high hp. While evo wizard have low hp and can be taken out by fireball plus arrows and is very fragile. Evo Wizard should not gets taken out by fireball plus arrows, same as executioner. Executioner is getting an evo, evo wizard will not replace executioner in any way.
[Freeze]
need a damage buff to take out spear goblins, or any other buff. The other spells are better than it. You do not see freeze in top ladder and its high elixer investment (4 elixer) is not worth it compared to the other cheaper spells. You can snowball, ice spirit, ice wizard that cost less and does better than freeze, which cost a lot and is less strong than other spells and the other cards with a freezing effect.