Whenever an Aura or Equipment you control is put into a graveyard from the battlefield, you may return that card to its owner's hand at the beginning of the next end step.
Tiana is a Boros Voltron/auras-and-equipment value engine: suit her up (or another evasive threat) and crash in, while her ability recurs your Auras and Equipment whenever they hit the graveyard. You build a board of cheap enchantments and equipment, protect your investment by sacrificing or letting them die and bouncing them back, then close with commander damage or wide aggression.
Built-in card advantage that turns Aura/Equipment removal into a non-event by returning them each end step
Boros has elite Voltron support: protection, double strike, and evasion to one-shot opponents
Flying and first strike make her a strong, self-sufficient carrier even without much investment
Synergizes with sacrifice and blink effects to repeatedly reuse ETB Auras and Equipment
Classic Voltron fragility: exile, bounce, and 'sacrifice'/-X removal of the creature dodge her recursion
Color identity lacks ramp, card draw, and counterspells compared to other colors
Heavy reliance on the commander makes the deck stumble after multiple board wipes or tax effects
Recursion only triggers on graveyard death, not exile, so she's weak to Swords/Path-style removal of your gear