grand archive mercurial heart booster box TCG Altered Edition Set Sealed English Grand Archive - Mercurial Heart

It was exclusively distributed through Mythical Pokemon Collection boxes, each containing 2 Generations packs alongside a promo card and figure

To solve You've cast four or more instant and sorcery spells this turn

Card Text If you control this Special Summoned card: You can target 1 Effect Monster on the field

With the addition of effect destruction resistance and target resistance, Toon transforms into a (almost) invincible monster

Also, if a spell has an alternate casting cost, like Force of Will's pitch-ery, then if you cast the alternate costs, you get the spell for free without counting as your spell for the turn