Summoning Circle

Summoning Spell List. Running Summoning Mastery,
Summoner, Enchanter and Channeler, so adjust those mana values up/down
accordingly. For brevity's sake, I'll leave the details of each summon
out - use the Battle Arena to check out their stats/abilities/spells if
you're interested. Note that upkeep applies on a per-summon basis -
summoning twelve skeletons will cost you twelve mana a turn, etc.

Healer Familiar. S/Life, 17 mana, 1 mana upkeep. Target friendly unit gains the ability to cast Heal.

Hell Hounds. S/Fire, 35 mana, 2 mana upkeep. Summons a Hellhound.

Raise Skeletons. S/Death, 21 mana, 1 mana upkeep. Summons a Skeleton.

Sprites. S/Wind, 42 mana, 2 mana upkeep. Summons a Sprite.

T2:

Floating Island. S/Water, 24 mana, 1 mana upkeep. Summons a floating island - a tile that acts like a boat.

Gargoyles. S/Fire, 42 mana, 3 mana upkeep. Summons a Gargoyle.

Harpies. S/Wind, 49 mana, 2 mana upkeep. Summons a Harpy.

Owlbears. S/Earth, 52 mana, 1 mana upkeep. Summons an Owlbear.

Wall of Force. S/Life, 29 mana, 1 mana upkeep. All wall sections in target friendly city gain +20 HP.

T3:

Nagas. S/Water, 84 mana, 3 mana upkeep. Summons a Naga.

Raise Mummies. S/Death, 105 mana, 2 mana upkeep. Summons a Mummy.

T4:

Dawn of the Dead. S/Death, 105 mana. Summons 2d6
zombies to target tile. Note that they will not be friendly - this is a
roaming neutral zombie pack.

Fire Giant. S/Fire, 140 mana, 6 mana upkeep. Summons a Fire Giant.

Griffins. S/Wind, 175 mana, 4 mana upkeep. Summons a Griffin.

Hill Giant. S/Earth, 140 mana, 6 mana upkeep. Summons a Hill Giant.

T5:

Angel. S/Life, 262 mana, 7 mana upkeep. Summons an Angel.

Nightmares. S/Fire, 280 mana, 5 mana upkeep. Summons a Nightmare.

Raise Banshees. S/Death, 315 mana, 9 mana upkeep. Summons a Banshee.

Wyvern. S/Wind, 280 mana, 6 mana upkeep. Summons a Wyvern.

T6:

Djinn. S/Wind, 420 mana, 8 mana upkeep. Summons a Djinn.

Efreet. S/Fire, 441 mana, 10 mana upkeep. Summons an Efreet.

Marid. S/Water, 420 mana, 10 mana upkeep. Summons a Marid.

Raise Wights. S/Death, 420 mana, 2 mana upkeep. Summons a Wight.

Resurrection. S/Life, 360 mana. Revives a dead hero.

T7:

Archangel. S/Life, 525 mana, 15 mana upkeep. Summons an Archangel.

Basilisk. S/Earth, 490 mana, 10 mana upkeep. Summons a Basilisk.

Chaos Spawn. S/Fire, 560 mana, 15 mana upkeep. Summons a Chaos Spawn.

Raise Wraiths. S/Death, 560 mana, 14 mana upkeep. Summons a  Wraith.

Sea Serpent. S/Water, 490 mana, 12 mana upkeep. Summons a Sea Serpent.

Storm Giant. S/Wind, 525 mana, 12 mana upkeep. Summons a Storm Giant.

T8:

Chimeras. S/Wind, 630 mana, 15 mana upkeep. Summons a Chimera.

Fire Drake. S/Fire, 756 mana, 25 mana upkeep. Summons a Fire Drake.

Hydra. S/Earth, 665 mana, 18 mana upkeep. Summons a Hydra.

Raise Dracolich. S/Death, 630 mana, 20 mana upkeep. Summons a Dracolich.

Expurgation. S/Life, 560 mana. Sends target army,
friendly or otherwise, to caster's summoning circle. Had a tendency to
freeze game when I cast it on enemy army.

Great Unsummoning. S/Water, 800 mana. Attempts to banish all enemy summons on target plane.

T9:

Portal. Pure Summoning, 777 mana, 35 mana upkeep. Every
 turn, a random creature is summoned in summoning circle. You still have
 to pay upkeep costs for creatures summoned in this manner.

In-battle spell list. Note that in-battle summons have
an associated upkeep cost, but this does not come in play in battle,
thus I shall not list them. They only apply if you somehow obtain an
in-battle summon as a permanent summon (like an Earth Elemental army via
 Silent Sentinels)-

T1:

Phantom Warriors. S/Water, 9 mana. Summons a Phantom Warrior.

Slime. S/Earth, 7 mana. Summons a Slime.

T2:

Raise Zombies. S/Death, 11 mana. Summons a Zombie.

T3:

Acid Elemental. S/Earth, 14 mana. Summons an Acid Elemental.

Air Elemental. S/Wind, 17 mana. Summons an Air Elemental.

Fire Elemental. S/Fire, 15 mana. Summons a Fire Elemental.

Sever the Bond. S/Life, 14 mana. Attempts to instakill target enemy summoned unit.

T4:

Water Elemental. S/Water, 24 mana. Summons a Water Elemental.

T5:

Phantom Beast. S/Water, 24 mana. Summons a Phantom Beast.

Shambling Mound. S/Earth, 28 mana. Summons a Shambling Mound.

T6:

Earth Elemental. S/Earth, 35 mana. Summons an Earth Elemental.

No T7, T8 or T9 in-battle summoning spells.

Source: http://pastebin.com/YDUxCpTC