+1 for enrage on shockwave giant, great idea
Idea for Gabrielle:
make her like the prophet, only the first card your opponent plays get the extra cost.
Idea for Ixxi:
At the beginning of your turn, if Ixxi is in your hand, you have to play Ixxi or discard another card from your hand.
If you play Ixxi this turn, you may not play another card this turn.
If Ixxi dies, Ixxi goes to your opponent's hand.
this way Ixxi can be more playable, and the play have a choice between discarding or not playing cards for the turn( can still use trading post or abilities) and the discarding mech will fit more with the exile mech.