If you can tap a creature for more than three mana, Sword Of The Paruns attached to it will always generate infinite mana at instant speed as you can keep untapping and tapping it for mana to use for Sword Of The Paruns' untap effect
But this ability really becomes a haymaker once Zinnia's other text lines are considered: Creature spells you cast have offspring 2
While it's obviously too early to predict whether that will be the case, it's certainly the right direction for a game that's always looking for a hook for each set - provided Sing Together isn't too powerful, it will once again deepen the game's varied strategies and offer another mode of skill expression
Among the numerous comments, praise for the OP's character was overwhelming: "I don't understand card values, but you're a stand-up guy." "No wonder people want to give you cards, I totally get it." "This is what a true legend looks like." "He definitely gained something far more valuable than the cards." While the cards might not have been astronomically valuable, the willingness to return them out of friendship speaks volumes
Ive got to admit, Im torn