Unconditional Love

Convoke (Your creatures can help cast this spell.
Each creature you tap while casting this spell pays for
{1} or one mana of that creature's color.)

If you lost the game, then you didn't lose the game and you gain 10 life. Use this instant only if you lost the game. Exile it, and this card can not return from exile under any circumstances.

“Valhalla will have to wait...”
—KMS Brünhilde