Cu Alter support help

Tamamo is an arts focused support so she is not a good option for Cu Alter so yeah Hans make the support paper pretty good there so go for it

Mash and Nightingale. They can keep Cu Alter alive with heal and DEF buffs. Nightingale also have 50% Buster Up for 3 turns, with only 5 turns cooldown at skill LV10. They also have 2 Buster cards each, so they can help complete Buster chains to maximise damage output.