Taking a stab at deconstructing (Intelligence and Constitution seem to be key stats):
At-Will Powers:
Aegis of Shielding
Swordmage Feature
You create an arcane link between you and a foe, allowing you to instantly
respond to its attacks with a counterassault.
At-Will ✦ Arcane, Teleportation
Minor Action Close burst 2
Target: One creature in burst
Effect: You mark the target. The target remains marked until you use
this power against another target. If you mark other creatures using
other powers, the target is still marked. A creature can be subject to
only one mark at a time. A new mark supersedes a mark that was
already in place.
If your marked target makes an attack that doesn’t include you
as a target, it takes a ---2 penalty to attack rolls. If that attack hits and the attacker is within 10 squares of you, you can use an immediate
interrupt to reduce the damage dealt by that attack to any one
creature by 6+Int points.
Booming Blade
Swordmage Attack 1
A field of sound punishes your enemy, and it becomes louder if your enemy
tries to escape.
At-Will ✦ Arcane, Thunder, Weapon
Standard Action Melee weapon
Target: One creature
Attack: Intelligence vs. AC
Hit: 1[W] + Intelligence damage, and if the target is adjacent to you at the start
of its turn and moves away, it takes 1d6 + Constitution thunder damage.
Sword Burst
Swordmage Attack 1
A sweep of your sword blasts those around you with force.
At-Will ✦ Arcane, Force, Implement
Standard Action Close burst 1
Target: Each enemy in burst
Attack: Intelligence vs. Reflex
Hit: 1d6 + Intelligence force damage.
Encounter Powers:
Chilling Blow
Swordmage Attack 1
Your blade rips into your foe and cold pulses from the wound, enveloping
your enemy’s body in a crust of frost.
Encounter ✦ Arcane, Cold, Weapon
Standard Action Melee weapon
Target: One creature
Attack: Intelligence vs. AC
Hit: 1[W] + Intelligence cold damage, and the target takes cold damage equal to your Constitution bonus each
time it attacks until the start of your next turn.
Corrosive Ruin
Swordmage Attack 3
You spin your blade in a tight circle in front of you, assailing foes with a
spray of flesh-melting acid.
Encounter ✦ Acid, Arcane, Weapon
Standard Action Close blast 3
Target: Each creature in blast
Attack: Intelligence vs. Fortitude
Hit: 1d8 + Intelligence acid damage.
Dimensional Warp
Swordmage Utility 2
You reach out with arcane power, and two of your nearby allies suddenly
wink out and reappear in each other’s places.
Encounter ✦ Arcane, Teleportation
Minor Action Close burst 3
Targets: You and one ally in burst or two allies in burst
Effect: Each target teleports into the other’s space. Both targets
must occupy the same size space, or the power fails.
Daily Powers:
Frost Backlash
Swordmage Attack 1
As your enemy swings for the kill, your warding suddenly turns to ice and
lashes out at your foe with the fury of winter.
Daily ✦ Arcane, Cold, Weapon
Immediate Interrupt Melee weapon
Trigger: An adjacent creature hits you
Target: The creature that hit you
Attack: Intelligence vs. Reflex
Hit: 3[W] + Intelligence cold damage.
Miss: Half damage.
Lingering Lightning
Swordmage Attack 5
Tendrils of bluish white lightning course from your blade to electrocute
your enemies.
Daily ✦ Arcane, Lightning, Weapon
Standard Action Ranged 5
Target: One, two, or three creatures
Attack: Intelligence vs. Reflex, one attack per target
Hit: 1[W] + Intelligence damage, and ongoing 5 lightning damage (save ends).
Miss: Half damage, and no ongoing damage