Schrodinger's Cat dies, graveyard turns it into a skeleton. Rewind skeleton; bones assemble into a dragon.
Salvagers can turn a single bone wall shield into an entire 7x bone wall. (though it does make for fun AI abuse)
Grey Nymphs get tattoos. The others do not.
Fate Eggs. Some VERY big things can come out of a very small egg. (and if the eggs ARE big, why can things so SMALL come out of them?)
Psions and shard of wisdom deal 'spel' damage. Reflective and emerald shields reflect 'spell' damage. Therefore, they should not work :p (/sarcasm)
If you play silence on an opponent, they can still chat on their turn.
Neptune and Seism get weapons that they cannot activate; 'other' weapons would be superior for them.
Spells without a target cannot harm immortal creatures. (pandemonium, rain of fire, desiccation, etc)
Sanctuary prevents dissipation field/shields from working, even though, presumably, this is a desirable thing.
Fire pillars are called burning. Air pillars are called wind. Time pillars are factories, not pillars. Darkness pillars are called obsidian. Water pillars used to be sapphire. Strange that they are not all following the same naming rules :p
My opponent has a shield and cannot be targeted by spells. Unless... I have the same shield. And hit myself with my own spell. (I do realize this is for balance reasons; it's just funny)