My opponent has a creature with hexproof. I activate my Detection Tower and kill their thing. On the same turn they play another creature with hexproof. Can I target the second creature on the same turn or do I have to untap and activate my tower again?
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The second creature can be targeted without another activation of the Tower. The Tower's ability does not change characteristics of objects nor does it change control of objects, therefore it modifies the rules of the game. And all new creatures fall under that new rule as well. It would be a different matter, if the Tower made creatures lose the hexproof ability, since then it would be changing characteristics of objects and the affected objects would then be locked in when the effect is created.
Detection Tower does not change anything about the creatures themselves. They still have Hexproof. Since the effect does not alter the characteristics of any objects, it can apply to anything new. Basically, it just says "hey, stokpile, you get to ignore hexproof until end of turn". This means that when they cast a new one, you still have an effect altering the game rules that says you get to ignore hexproof.
Awesome, thanks a bunch. Always a bit hard for me to tell when something alters something in the game or just changes the game rules entirely.
You really only have to look for two things: change of characteristics, or change of control. If neither is done by the effect, it changes the rules of the game and can affect objects that didn't exist when it was created.
611.2c If a continuous effect generated by the resolution of a spell or ability modifies the characteristics or changes the controller of any objects, the set of objects it affects is determined when that continuous effect begins. After that point, the set won’t change. (Note that this works differently than a continuous effect from a static ability.) A continuous effect generated by the resolution of a spell or ability that doesn’t modify the characteristics or change the controller of any objects modifies the rules of the game, so it can affect objects that weren’t affected when that continuous effect began. If a single continuous effect has parts that modify the characteristics or changes the controller of any objects and other parts that don’t, the set of objects each part applies to is determined independently.
Former Rules Advisor
"Everything's better with pirates." - Lodge
(The Gamers: Dorkness Rising)
"Any sufficiently analyzed magic is indistinguishable from science."
(Girl Genius - Fairy Tale Theater Break - Cinderella, end of volume 8)
You really only have to look for two things: change of characteristics, or change of control. If neither is done by the effect, it changes the rules of the game and can affect objects that didn't exist when it was created.
Former Rules Advisor
"Everything's better with pirates." - Lodge
(The Gamers: Dorkness Rising)
"Any sufficiently analyzed magic is indistinguishable from science."
(Girl Genius - Fairy Tale Theater Break - Cinderella, end of volume 8)