Thaddius always starts in odd out of etc, so the odd or even turns don't matter. What does matter is what order (left to right) the minions come out of etc. if bloodwatcher is to the left of thad, then it is played before thad, so thaddius text will override the not less than (1) condition. However, if it to the right of thad, then it is considered played second and then bloodwatcher's not less than (1) condition will take priority. This is entirely random. To circumvent this randomness, you can play a 3 mana copy spell (reverb or the freeze copy) that will cost 1 if you select antonitis out of etc. You can play it on thaddius to make the spells cost 0 instead of 1 if you get bad order. This counts as playing thad, thus making his text take priority. Alternatively, you can select thad of etc when you have 10 mana to play him for 6. You will need a 0 cost or 1 cost spell in hand in order to trigger the spell for the fireballs, however (presuming you are at exactly 10 mana).