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Enabling High-Cost Spells: Blue ramp cards allow you to cast high-cost spells earlier in the game, catching opponents off guard

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

The first player can finish their turn as normal from there, either by playing a character, item, action, or song or taking some other available action or no action at all

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