Well those are the last two. On easy they can be done pretty easy - for the 'rogue' wizard which is a gremlin - keep some snakes or paladin near the middle to kill the towers when he spawn them - have astral resistance if possible (helm and armor) and use snake and spawn plants to whack him.
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If you want to be cheesy use black knights esp if you have tghe black knight items (helm, staff (not necessary) and that blue thing from the dark knight after he repents)
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The lizard is a lot harder - i've done it a few times with brute force but these days I just cheese him with black knights - i normally play no loss on impossible - on easy he should be easy. ALso demetroiligst are helpful since their spawns are pretty strong - you can always make them from archmages at the trainers.
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so good troups are paladin, demotrolights, plants, arch mage, and those elvens that have sleep spell and spawn more plants - naturally you can't use all of em.
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The lizard is a lot harder - again have astral resistance and paladin et all. For the no loss I usually just use two troups paladin and black kngihts - so i only have to restore those two using time back and evlin spells. I also tend to use phantom on the paladin to give me more mobility. Remember the spot adjacent the lizard by the left arm he can't hit you - though his spanws can hit you and when you does the mass astral attack that hits you.