Manacept

Basis: Spell casters, mainly. Ya, Mages, druids, and such... (many edits to go)

Top-Tier Cards

The monster:

Name: Arzanthus, the great sage
Cost: 9 Earth.
Hits: 550
Special: Each turn, you may recover one chosen attack or support card from your grave. When this unit is killed, it's removed from play instead. When multiple copies of this unit are present, terminate the old one.

The attack:

Name: Trinity Wave
Cost: 5 of whatever element the attacker is.
Special: All enemies loose hits equal to 15 times the total manna you have presently.

The support:

Name: Stonehenge
Cost: 8 earth
Special: You gain 2 manna of whatever manna values are present in the monsters and support cards presently active under your control per turn.