This can happen one of two ways: (1) the door becomes unlocked on the battlefield or (2) the door becomes unlocked as the Room enters the battlefield because you cast the corresponding half
Zidanes enters-the-battlefield trigger obviously feeds this, as youll net one Treasure token when your opponent regains control of the Creature you stole
Ornery Dilophosaur gets just +2/+2, no matter how many creatures you control with power 4 or greater
Card Set(s) -Two Legends- [OP-08] CARD VIEW OP08-023 | SR | CHARACTER Carrot (Parallel) Attribute Special Block Icon 2 Effect [On Play]/[When Attacking] Up to 1 of your opponent's rested Characters with a cost of 7 or less will not become active in your opponent's next Refresh Phase
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This could have some impact if you're ramping the opponent to their end game options even faster