Sorry for necro, but I think i may have a very simple fix:
If a team cannot build a legal deck, but has enough cards to build a deck (more than 30). then they are given X amount of free conversions of any off element card to a card of that team's element.
For example:
has 8 stone pillars, 2 earth pendulums, 5 hourglasses, 5 flying weapons, 6 titans, 4 antlions, and 5 photons left in the vault and 1 player that still needs a deck
can legally field all their players
cannot build a legal deck. The amount of on-element cards in
's vault is 14, just under the required 15 to make the 50% cutoff. Because
would be otherwise forced to suicide that round, they are given 1 conversion.
This conversion can be used to take
any off element card and convert it into an on element card.
So using the conversion,
can do any of the following conversions:
-1 hourglass, +1 card-1 titan, +1 card-1 flying weapon, +1 card-1 photon, +1 card
by doing this, the team is indeed presented with a possibly crappy deck, but it's not a suicide and it gives them a fighting chance.
This system is balanced, by gaining an on-element card in replace of an off-element card, it creates a balanced transfer. They have 1 more of card X, but one less of card Y.
What do you think?