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[All Turns] When any of your [Three Musketeers] trait Digimon would leave the battle area other than by your effects, by trashing 1 Option card from this Digimon's digivolution cards, they don't leave

Its worth mentioning Imperial Seal here, as it does roughly the same thing, though it gives folks a whole turn cycle to mess with the top of your library

For instance, I could imagine a deck with four Relentless Dead, four Fleshbag Marauder, and three Sidisi, Undead Vizier as most of or the only Zombies

Its just another game mechanic

Placed in a graceful floating pose, Mega Gardevoir ex sits at the centre of the card as ethereal mega energy radiates outward in geometric waves reminiscent of ceremonial mandalas