However, I am not sure what your budget is or what you can play within the Sentinel Clan.
I can recommend Aviria Ld on the exception you do not have Copper Cr. However Aviria Ld does not have that virtual 9 Power compared to Copper Cr.
If you cannot afford Copper Cr, on the bare minimum, try getting Havok or Pavel. If not, look for another alternatives for Copper Cr or any other card you cannot afford and change your card combinations to less than 25* to get more points in DT.