written Land of Sweets and Mallows

[Hallohallo 19]

A Field Spell to boost your friendly neighborhood Hallos and turn luck to your side.

Land of Sweets and Mallows

[Field Spell]

"Hallo" monsters you control gain 500 ATK/DEF for each card in your Pendulum Zone. When you Pendulum Summon monster(s) while you have a DARK Normal Pendulum Monster Card in your Pendulum Zone, your opponent cannot activate cards or effects. When an effect of a card in your Pendulum Zone is activated that rolls a six-sided die or tosses a coin 1 time: You can banish 1 Pendulum Monster from your GY, face-down; choose the result of that die/coin.

[Summer Darj 292]

I would rewrite the protection effect as:

While you have a DARK Normal Pendulum Monster Card in your Pendulum Zone, your opponent cannot activate cards or effects when you Pendulum Summon a monster(s).

Anyway, I like the card. It may not search like "Field ROTAs", float or enable cards like Diagram or Sky Iris but being able to choose the results for your die rolls and coin tosses is big, IMO. Sucks that it needs some set-up, but it's only fair considering the shenanigans it can enable.
I suggest to allow you to choose to result of 1 die or coin for effects that roll or toss multiple times, just to help such effects a bit.