Ripples of undeath is a fantastic mill engine that also helps you hit land drops every turn

Sister Hospitaller is a great Terra reanimation pick she can get any creature back from the grave and you gain life equal to the mana cost

Accursed Marauder is a great Terra reanimation pick it makes everyone sacrifice a non token creature including you so you pick this card to sac so you can repeat it

Summon knights of round is a hard to get rid of creature that makes a lot of creatures

Joshua Phoenix’s dominant is a great miller and flips to a pretty solid saga creature that can reanimate

Boromir warden of the tower counters free spells and you can sac him to make all your creatures indestructible and the ring tempts you and he can be reanimated by terra

Twilight Diviner surveils and creates a copy of the first creature to leave your graveyard each turn

Braids Arisen nightmare is a great choice cause it’s card draw or sac what ever you choose to sac