This level 10 wizard is a great card for many decks, both for combat and phase 3. Being a dragon and a flyer allows Lareth to use the dragon-only wizard spells and unarmed combat cards. Being a flyer also opens up the range of realms you can attack a great deal. Lareth's permission granting power is his weakest as it affects only dragons casting wizard spells, although the dragon need not be a wizard, just trying to cast a wizard spell will do to activate this power. Not needing to ask permission himself to cast spells is a very positive power. This means Lareth can cast wizard spells even if an opponent has out Midnight, Goddess of Magic [3rd-46] or the Icon of Magic [RR-c19] or any other card that would force Lareth to have to ask permission to cast. This would also work for cleric spells if Lareth somehow got the ability to cast them.

The most potent of Lareth's power is his immunity to all cards designated as offensive. This includes unarmed combat cards like Fighting Dirty! [DU-c3] as well as spells, blood abilities, psionic power cards, thief skills, and magic items. Since immunities are always in affect, Lareth is protected from such cards even while in the pool. What Lareth's immunity doesn't protect against are the powers of artifacts, allies, rule cards and champions as well as harmful events or any card marked (Def). It is important to note that some early editions of champions or artifacts are marked as being (Off). Lareth is not immune to these champions as these are typos.  

Lareth's immunity to offensive cards (spells, psionic powers, unarmed combat cards, blood abilities, thief skills) includes cards designated as offensive through blueline rules. Champions and allies are never designated as offensive or defensive (although some champion and ally powers are offensive), therefore Lareth has no immunities to champions or allies.