Your regain has been approved! Mercedes can regain these abilities whenever you'd like, and her Crest will be 2 points.

As for the gacha:

Plant Staff: A staff that will grant the wielder moderate plant manipulation power or if the user already has that ability, it will boost their power a fair amount.

Gelly Roll Pens: A pack of sparkly gelly roll pens. They are as difficult to write with as you remember.

Fireworks: A box of fireworks

Snake Eye Dice: A pair of bone dice that look cool but are enchanted to roll snake eyes no matter what.