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Each Pokemon TCG: Sword & Shield-Chilling Reign Build & Battle Box includes: A 23-card Evolution pack featuring key cards from current and prior sets, including 1 of 4 alternate-art promo cards 4 Pokemon TCG: Sword & Shield-Chilling Reign booster packs 1 deck-building tip sheet 10 boxes per display

Their trigger reads, Whenever a land enters the battlefield under your control, you may gain control of target creature for as long as you control Roil Elemental. So, basically, as long as you can keep Roil Elemental alive, you can absolutely steal every other Creature on the battlefield

And at the very least, you can hide behind a one-prize creature while you chip away and build up your board

If the math adds up, you can use this to knock out a Pokemon that is close to being knocked out and secure the points you need to win the match