I think I'll just repeat what I said in the chat:
You have two teams of wizards. In order to make a move you must change shape into a creature or thing that beats, defeats or otherwise trumps whatever the other side has just changed into. So you might get a sequence like
Wizards: Elephant
Witches: Mouse
Wizards: Cat
Witches: Dog
Wizards: B - A - T - H
Witches: Telephone
at which point I have to admit I'm stumped so presumably the witches win that round.
Green
Lead piping in the kitchen
Goldenrod
An embedded hyperlink
aqua
Your nephew, who despite being only eight knows more about computers than you ever will
Azure
Napalm - It's the only language they understand.
aqua
The cold vacuum of space
Green
The total perspective vortex
Puce
Ace Rimmer. What a guy.
Olive
Victory for Simons Mith I feel.
Puce
Thank you. I was quite pleased with that one.
Marmite
Puce
The invincibility of the ten-tonne lime is something that surprises me, but I haven't thought of a satisfactory counter. Time to award this one to Tuj … and put the game into storage ready for next time.
Audience
*shouts, screams, generally goes wild for Simons Mith*
Puce
… An eleven tonne lime. Dammit, l'esprit d'escalier rides again.
aqua
All I could think of was Lyme disease.
Lime
A million gallons of G&T? But that'd just be getting silly, eh?
goldenrod
I'm a tad rusty in my French. I translate l'esprit d'escalier as "the phantom staircase". This is obviously a cunning metaphor for something to do with eleven tonne limes (or perhaps twenty-one tonnes of limes), but the meaning escapes me.
L'esprit d'escalier
It's an idiom for thinking of some witty retort just after the last moment.
#66FFCC
Isn't it "the spirit of the staircase?"
Puce
Let's start a new one. An eleven tonne lime
An industrial lime-squeezer
Blue
A hell of a lot of Mojito Mix
Blue
President Franklin Roosevelt
#66FFCC
The Saudi Monarchy
This is the end of the line. There is no more.