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Say I have a Perplexing Chimera.

Text: Whenever an opponent casts a spell, you may exchange control of Perplexing Chimera and that spell. If you do, you may choose new targets for the spell.

Then I bestow Hypnotic Siren on my own Chimera (I still control it).

Now when I use the Chimera to steal my opponent's spells, I think the siren will keep it under my control, because I'll still control Siren as an aura. I can gain control of everything my opponent casts.

Does this work??

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+1: For a nice try. – deworde Apr 24 '14 at 15:26

No, this does not work. Exchanging control using Chimera's ability sets up a continuous effect; the same as the one created by Hypnotic Siren (or Mind Control, etc). When there are multiple effects that are applied in the same layer, they are all applied in timestamp order. This means that because the Chimera's ability resolved after the Siren's ability, your opponent will get the Chimera back.

613.6. Within a layer or sublayer, determining which order effects are applied in is usually done using a timestamp system. An effect with an earlier timestamp is applied before an effect with a later timestamp.

613.6a A continuous effect generated by a static ability has the same timestamp as the object the static ability is on, or the timestamp of the effect that created the ability, whichever is later.

613.6b A continuous effect generated by the resolution of a spell or ability receives a timestamp at the time it's created.

Discussion on this interaction with Mind Control here.

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