I had a couple of combos occur to me, and I thought I'd share them with the community. Like the title says, these are stupid. They're amusing, but no one will ever confuse them for an efficient combo.
Hellfire Trap x6 + Teleport Trap x6
In a less balanced game, you'd be able to stack multiple Hellfire Traps in a single zone. Since we can't do that, we can do a similar thing: cast both a Hellfire Trap and a Teleport Trap on every zone available. Assuming that teleporting a creature to a new zone counts as "entering" that zone, you can set up a roller coaster of fire that dasy-chains from one zone into the next. When a creature enters the first zone, trigger both enchantments. Resolve the Hellfire first, then teleport the creature into the next zone, where two new traps are waiting.
Is this efficient? No. Is it amusing to bounce a mage (or other enemy creature) back and forth around the board dealing up to 6, 4 dice attacks? Yes. Add Mangler Caltrops for even less intelligent fun. And end in a poison gas cloud. Why not?
Enchanter's Ring + Decoy x6
Haven't wasted enough actions on the last combo? Try this one too!
Once a turn, Enchanter's Ring lets you spend one less manna to cast an enchantment on a friendly creature. So cast Decoy on yourself for only 1 manna. At a later date (for example, right before casting another decoy on yourself), reveal it for 2 manna. Net gain of 1 manna. This is actually not a completely stupid combo if you're going to have the Enchanter's ring out anyway (it's a good card!). If you're ever in a situation where your mage can't use up both his actions, you might as well meditate on a decoy to gain 1 manna, right?
Both of these combos could also be used with Fellella. She provides extra actions to make laying down all those traps somewhat less stupid, and though casting a decoy with Fellella prevents you from using the Enchanter's Ring, it does convert a little mana from your Familiar to mana for your Mage, which can be a useful one time tactic if you're 1 or 2 short on a big turn.
Got any other stupid combos?