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As an attack trigger

The third point of toughness is key to be able to survive the cheap sweepers of the format, Kozileks Return and Flaying Tendrils

The last drawback is MDFCs

After getting to know it was Phyrexian Metamorph I started putting together an Emry, Lurker of the Loch deck while sketching the piece

Sure, its no Pacifism, but its still a top tier removal spell that other colors will be happy to splash

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