The idea is to attempt to force an opponent to dump a lot of creatures into their graveyard and then pull them out with Tariel, trying to abuse the low cost by doing a lot of untaps on her with other artifacts. Should probably also have enough other cards to steal from other peoples graveyards. Might want to sac own creatures for mana and then pull them back from the graveyard with Tariel.
Also check for effects on "when angel becomes tapped".
Look into atrifact and enchantment stealing as well.
Check for sacrifice possible infinite mana combo by sacrificing then returning etc. (ex. sac some creature that produces treasures + some ability that produces mana artifacts on sacrifice, then pull out of graveyard again)