Let say, you control: Nissa Who Shakes the World and any man land, for example: Mobilized District.
You use Nissa's +1 to turn the land into a 0/0 elemental w/ three +1 counter on it.
Later, you decide to animate Mobilized District, you now have a 3/3 Citizen creature land with three +1 counters on it.
My question is: what happens at the end of turn?
My understanding is that at the end of the turn, the land stops being animated, and loses his creature type.
That is: it *does not* go back to be 0/0 elemental.
However, if I'm correct, in that case, it should be possible to re-use Nissa's +1 ability to add three additional +1 counters on it.
Which rules from the comprehensive rules book respond to this question?
The effect of Nissa's first ability making the targeted land "a 0/0 Elemental creature with vigilance and haste that's still a land" is an effect that lasts for the rest of the game, since it comes from a resolving ability and doesn't specify how long it lasts (C.R. 611.2a). On the other hand, the effect of Mobilized District's second ability making Mobilized District "a 3/3 Citizen creature with vigilance [that's] still a land" lasts only "until end of turn" (C.R. 611.2a). Even if the latter effect overwrites Mobilized District's base power and toughness for a time (C.R. 613.1g, 613.1b, 613.4, 613.6, 613.6b, 613.7), the Nissa effect is still present (since both effects say the affected permanent is "still a land" and don't have the form "[creature types] artifact creature", they don't remove any prior subtypes or card types the permanent may have [C.R. 205.1b], so that in this scenario, for example, Mobilized District is a Citizen Elemental creature land while both effects are active on it), so that once the Mobilized District effect ends, Mobilized District will remain "a[n] ... Elemental creature with vigilance and haste that's still a land", but will go back to having power and toughness 0/0 (as modified by +1/+1 counters on it and other applicable effects, if any) (C.R. 613.1g, 613.3). Since Mobilized District will remain a creature, it can't be the target of Nissa's first ability, which can target only a "noncreature land you control" (C.R. 115.1c).
An effect that says a permanent "becomes ... [N/M]" is an effect that "set[s] power and/or toughness to a specific number or value" under C.R. 613.3b. Even if such an effect is present on a creature, power/toughness-changing effects from +1/+1 counters still apply to that creature (C.R. 613.3d, 613.4).
EDIT (Oct. 31): Correctness edit in view of rule update with Throne of Eldraine.
Thank you very much for this very quick and very detailed replied!
Thanks a lot also for all the C.R references.
What I was missing (and didn't know) was the full meaning of "still a" described in C.R. 205.1b.
I was unaware that this statement had the same effect as "in addition to its other types".
I incorrectly assumed that it would only retain its land type, and therefore the creature type would be overwritten by the card's activated ability.
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You use Nissa's +1 to turn the land into a 0/0 elemental w/ three +1 counter on it.
Later, you decide to animate Mobilized District, you now have a 3/3 Citizen creature land with three +1 counters on it.
My question is: what happens at the end of turn?
My understanding is that at the end of the turn, the land stops being animated, and loses his creature type.
That is: it *does not* go back to be 0/0 elemental.
However, if I'm correct, in that case, it should be possible to re-use Nissa's +1 ability to add three additional +1 counters on it.
Which rules from the comprehensive rules book respond to this question?
An effect that says a permanent "becomes ... [N/M]" is an effect that "set[s] power and/or toughness to a specific number or value" under C.R. 613.3b. Even if such an effect is present on a creature, power/toughness-changing effects from +1/+1 counters still apply to that creature (C.R. 613.3d, 613.4).
EDIT (Oct. 31): Correctness edit in view of rule update with Throne of Eldraine.
Thanks a lot also for all the C.R references.
What I was missing (and didn't know) was the full meaning of "still a" described in C.R. 205.1b.
I was unaware that this statement had the same effect as "in addition to its other types".
I incorrectly assumed that it would only retain its land type, and therefore the creature type would be overwritten by the card's activated ability.