I enchanted an Evil Twin with a Song of the Dryads. Does the evil twin keep the ability to tap to destroy creatures with the same name?
The mtg ruling for Song of the Dryads is:
The enchanted permanent loses any card types, subtypes, and colors it previously had. It keeps any supertypes it had and its name remains unchanged. It gains “Tap: Add Green” and loses all other abilities from its rules text. It will still have any abilities it gained from other effects.
Does Evil Twin's added ability count as an ability from other effects?
305.7. If an effect sets a land’s subtype to one or more of the basic land types, the land no longer has its old land type. It loses all abilities generated from its rules text, its old land types, and any copy effects affecting that land, and it gains the appropriate mana ability for each new basic land type. Note that this doesn’t remove any abilities that were granted to the land by other effects. Setting a land’s subtype doesn’t add or remove any card types (such as creature) or supertypes (such as basic, legendary, and snow) the land may have. If a land gains one or more land types in addition to its own, it keeps its land types and rules text, and it gains the new land types and mana abilities.
Evil Twin gives that ability in a copy effect, so it is lost according to this rule.
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The activated ability Evil Twin acquires when it becomes "a copy of any creature on the battlefield, except it has" that ability, is part of Evil Twin's copiable values (C.R. 706.9a), and thus is part of the copy effect and not a separate effect. (Note that Evil Twin now says "...except it has..." rather than "...except it gains..."; check its Oracle text [C.R. 108.1].) Copy effects are in a lower layer than effects that add types or subtypes (such as the effect of Song of the Dryads making the "[e]nchanted permanent ... a ... Forest land") (compare C.R. 613.1a with C.R. 613.1d), so the latter effects are thus layered on top of the former (C.R. 613.1). And since a basic land type is added this way, here, Forest, the permanent "loses all abilities generated from ... any copiable effects affecting that land", including the activated ability in question (C.R. 305.7, 305.6).
EDIT (Jun. 18): Edited to conform to rule changes with Modern Horizons 2.
I enchanted an Evil Twin with a Song of the Dryads. Does the evil twin keep the ability to tap to destroy creatures with the same name?
No.
If you take a look at rule 613.1, you'll see that any copy effects (such as Evil Twin's own effect) are to be applied to the card BEFORE any type-changing effects (such as Song of the Dryads').
If that were the end of it, Evil Twin would retain its killing ability.
However, Song of the Dryads' effect sets the subtype of the card to FOREST, which is a basic land type. Such effect are special and fall under rule 305.7, which additionally makes the card lose any ability granted by the copy effect, including Evil Twin's killing ability.
The mtg ruling for Song of the Dryads is:
The enchanted permanent loses any card types, subtypes, and colors it previously had. It keeps any supertypes it had and its name remains unchanged. It gains “Tap: Add Green” and loses all other abilities from its rules text. It will still have any abilities it gained from other effects.
Does Evil Twin's added ability count as an ability from other effects?
Evil Twin gives that ability in a copy effect, so it is lost according to this rule.
Awesome avatar provided by Krashbot @ [Epic Graphics].
EDIT (Jun. 18): Edited to conform to rule changes with Modern Horizons 2.
If you take a look at rule 613.1, you'll see that any copy effects (such as Evil Twin's own effect) are to be applied to the card BEFORE any type-changing effects (such as Song of the Dryads').
If that were the end of it, Evil Twin would retain its killing ability.
However, Song of the Dryads' effect sets the subtype of the card to FOREST, which is a basic land type. Such effect are special and fall under rule 305.7, which additionally makes the card lose any ability granted by the copy effect, including Evil Twin's killing ability.
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