//EDIT:
It would be more interesting to guess each battle´s winner. Like set 1k electrum on fire as winner against time and getting a prize relating to your amount of electrum bet.
example:
<=100 electrum [LOSE: lose your electrum] [WIN: win a random card and 1*electrum bet]
>=100 electrum [LOSE: lose your electrum] [WIN: win a random rare and 1,25*electrum bet]
>=500 electrum [LOSE: lose your electrum] [WIN: win a random upped rare and 1,5*electrum bet]
>=1,5k electrum [LOSE: lose your electrum] [WIN: win a random nymph and 1,75*electrum bet]
>=3k electrum [LOSE: lose your electrum] [WIN: win a random upped nymph and 2*electrum bet]
>=5k electrum [LOSE: lose your electrum] [WIN: win a random upped nymph, a random rare and 2,25*electrum bet]
btw: I´d pretty much like to see an ingame war- and tournement-engine were this is included. This would only give a lot of attention to the challengers as player, but also as someone who bets. Maybe players who compare in tournaments and wars have to save their decks for the battle before (can´t be changed afterwards) and as a player who wants to bet you can bet on a player and his deck. Just fantasy, but... imagine it gets real