This is due to the layers system. Blood Moon's effect depends on whether or not Arixmethes is a land, but Arixmethes doesn't depend on Blood Moon's effect, so Arixmethes's "this is a land" ability applies first. Then Blood Moon turns it into a mountain. If you're able to remove the slumber counters some other way (Vampire Hexmage or Thief of Blood, probably), then Arixmethes will stop being a land, and thus stop being affected by Blood Moon
October 5, 2018 8:43 a.m.
This is kind of a dumb reply but would i be able to remove a slumber counter while Blood Moon is in play or do i have to do it while its on the stax?
October 5, 2018 9:16 a.m.
Arixmethes, Slumbering Isle does not have its own ability to remove counters while Blood Moon is in play, so you'd have to cast enough spells while it's on the stack if you want to remove them that way. You can remove them while Blood Moon is already in play using one of the methods Kogarashi mentioned to turn it into a creature.
October 5, 2018 10:40 a.m.
Is Arix's ability to become a creature without counters still a thing even under blood moon? Does removing the counters with Vampire Hexmage post-blood moon actually do anything?
So, even if you have blood moon in play, a player can cast Hexmage, remove all ice counters from Dark Depths and it will stop being a mountain and be a creature instead?
October 5, 2018 10:54 a.m.
- No, Arixmethes doesn't have the "Whenever you cast a spell..." ability. If an effect sets a land to a basic land type without also saying "in addition to its other types" then it also removes any abilities printed on the card.
- Yes, Hexmage will let you turn Arixmethes into a creature. Because Blood Moon's type-changing effect is dependent on Arixmethes' type-changing effect, Arixmethes' effect is always evaluated first. If Arixmethes doesn't have any slumber counters then it's a creature and Blood Moon won't apply to it.
October 5, 2018 11:56 a.m.
Sorry for hijacking the thread, but thanks for the answer nontheless!
October 5, 2018 12:34 p.m.
And it doesn't work for Dark Depths because the Depths won't have the ability to be sacrificed once there are no ice counters on it if Blood Moon is in play. It'll be a nonbasic mountain with no ice counters on it. However if you were able to get rid of Blood Moon, then the Depths' ability to be sacrificed would trigger due to having no ice counters, and you would get your Marit Lage token.
In Arixmethes, Slumbering Isle's case, it's not a land card, it's a creature that has a replacement ability that turns it into a land instead if conditions are met, and thus it's the layers system that allows the removal of the counters to stop Blood Moon from affecting it, rather than a triggered ability.
October 5, 2018 4:15 p.m.
October 5, 2018 5:07 p.m.
If you require no further clarification, please select an answer to remove this from the unanswered queue. If you require clarification, please ask for it so we can completely clear up your question.