Ok so I am trying to make a demonic portal deck that is good enough to use in Adventure Mode but I have no idea how to build a proper one. So could some one help me with building one?

This is what I used. Cheap and very effective.

lv2 -Don't evolve him to 3, Attack bonus is a liability when you play Portal
- A must have, her Recycling ability is awesome
- Good for thinning your deck to 19 cards since he plays at the beginning of the game.

These are core, put them then fill your deck with defensive cards:
2-3x - you need only one to attach to boss, but carry 1 or 2 more for increased draw chance
3x
3x
1x - if you have Iron Mask.

For good defensife cards consider something like , .

A version my friend used, replace with and with . Gives you a better last-stand if things don't go your way.

some cards to recylce portals: contact, break the second chain,

wanted/freeze/sentence are useful against some bosses

also some defensive cards like double clay or brawl with dimizar are fine

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A little late but thanks. The deck worked perfectly.