But Sardonyx does cost twice the spell book points as Andy does... Andy has half the HP, but has 3 armor which is worth quite a bit. Both have a sweeping attack, Sards gets one more dice, but Andy gives out burns...
Andy's quick attack seems ... hmmm where's a statistician when you need one - Andy has 6 dice plus burns vs 5 dice + 2 piercing... against the right creatures, the piercing probably works better.
Its a challenging trade off, which perhaps means it will get more play. Sure you could carry two Andy cards for the same SB points, but that's like 48 points to cast... So having Sards in the book is probably a bit more commitment to a certain strategy...
Although I'm thinking I haven't contrasted the - 2 life vs finite life to living creatures in zone - seems a great creature to sit on top of the enemy mage and whale on him with...