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This is how I think you should develop a Sanctuary Mage (for playing against the AI).
Kalindra, Sanctuary, Mage, level 30.
Skills (in chronological order of gameplay):
0) Ice Block (specialization)
1) Education
2) Healing
3) Tutelage
4) Magic Affinity 1
5) Slippery Ground
6) General Healing
7) Find Path
8) Guardian 1
9) Steal
10) Secret Keeper 1
11) Blizzard
12) Guardian 2
13) Aggressor 1
14) Secret Keeper 2
15) Stop Time
16) Summon Earth Elementals
17) Explosion
18) Secret Keeper 3
19) Aggressor 2
20) Retaliation 1
21) Retaliation 2
22) Leader 1
23) Leader 2
24) Dispel Magic (initial magic)
25) Cloud of Poison
26) Fortune 1
27) Fortune 2
28) Endurance 1
29) Endurance 2
30) Siege Master 1.
The combination of the spells listed below, which are available as early as level 5, leaves opponents with little chance. You need to use them right from the start for rapid development.
1. "Ice Wall". A great spell. I place it first turn right in front of the enemy ranks; they go around it, and some of them get frozen. However, ARCHERS can break through it.
2. "Slippery Ground" is a MEGA SPELL; no need for further comments. If you think about it, it's better than Stop Time, as it slows down two enemy stacks at once for 2 turns.
3. The "Blizzard" spell is also good; it's a kind of equivalent to "Cloud of Poison," but at level 5. It's a pity that it only lasts for 2 turns. A good combination is "Slippery Ground" and then placing "Blizzard" on top.
4. Yuki-onna's "Ice Shards" is also a great spell!