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
You see an unfair number of cards, but you need to make choices
Both decks are reconstructed decks of 60 cards that include a pair of foil cards featuring the characters pictured on the front of the box
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If it changes zones, it will either cease to exist (if it's a token) or cease to be a copy (if it's a nontoken permanent), and so you won't be able to cast it as an Adventure
#5 The problem with tribal is the incentive cards suck unless a good part of your deck supports that tribe, and picking cards that supports that tribe usually means you have to ship better cards