This card works well in a "Mist Valley" deck, which focuses on returning cards from the field to the hand.
This card has great synergy with "U.A." decks, as every "U.A." monster can be special summoned by returning other "U.A."s from the field to the hand.
You can perform a Life Gain loop by doing the following: While having "Brionac, Dragon of the Ice Barrier" on the field and "Fabled Kushano" (preferably in Graveyard) and 1 "Fabled" monster that Special Summon itself after discarding to the Graveyard (preferably in hand), activate "Fabled Kushano" effect and discard "Fabled" monster from hand, then Special Summon it with it's effect. Activate the effect of "Brionac" and discard "Kushano". Return early Summoned "Fabled" to your hand. Gain 500 LP from "Spring of Rebirth". Repeat until you have "infinite" Life Points.
This also works with any 2 "Fabled" monsters that Special Summon themselves after discarding. In that case discard 1 "Fabled" monster from hand for the effect of "Brionac" to return 1 Fabled monster on the field to the hand.
This loop works with "Brionac, Dragon of the Ice Barrier" and "Archlord Kristya" too. Have "Brionac" on the field and 4 Fairy type monsters in your graveyard. Special Summon "Archlord Kristya" with his own effect, then activate "Brionac"'s effect to return a card to your hand. Discard the Fairy-Type monster card that you returned to your hand to Special Summon "Kristya" and target "Kristya" for "Brionac"'s effect to return it to your hand. Then Special Summon Archlord Kristya" again. Repeat this to gain "infinite" Life Points.
You can perform a Life gain loop by combining 2 copies of this card with "Ultimate Offering" and "Honest"; activate the effect of "Honest" and keep on Normal Summoning it until you have a huge amount of Life Points.