You can always use stuff like "reserve mana" (aka when you summon you reserve X% mana) or simply have the minion "drain" your  mana (as long as he is summoned you louse like 2MP per 3 seconds).

This way you ensure that non-spellcasters can't abouse this and summoning more then 1 minion might not be the best Idea.

Minion stats shoud be equal to the summoning skills (the better the skill the better the minion) or a sytem equal to this

Lvl 1: 50% change to summon (the other 50% you get a hostile minion) a lvl 1 minion

Lvl2: 55% chance to summon a lvl 1 minon

Lvl3: 55% chance to summon a lvl 1 minion while 5% resulting in a lvl 2 minion

etc.

so at higher skill mastery the minimul level of your minion is guarantied (or hell you cen even incrise the nr. minions).

Hare are some head swaps ...

If you guys do recolors why not add a little texture ? Heres a random one:

This is pretty neat : )

Bonus Door

Boss Door

Gewels