You get to cast whatever you found useful in the 7-card batch, and regain your reactive cards at the end of the turn
If you control Grove of the Burnwillows, and Punishing Fire is in your graveyard, a smart opponent wouldnt target your Punishing fire with his or her Extirpate, because in response to the Extirpate you would activate the Groves mana ability which will not only give you red mana, but also grant life to your opponent
Defensive phase-outs like Teferis Protection also allow creatures to dodge boardwipes, edicts and other non-targeted removal, where many flicker effects simply return them to the battlefield in time to perish by the next spell you had been responding to on the stack
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Chapter II The Doctor investigates the situation, trying to figure out why there would be anyone on Earth who would be such a high priority for the Judoon
The dragon dominates the M2 1 cards worth money, having an extended-art foil version that is valued at around $82