Elsewhere Flask tricks

[JollyRogers]

I am VERY certain I know the answers to these two questions, but I got in to a little debate on MWS about these and figured I may as well ask.

Elsewhere Flask 
Artifact
Rules Text (Oracle):    
When Elsewhere Flask comes into play, draw a card.
Sacrifice Elsewhere Flask: Choose a basic land type. Each land you control becomes that type until end of turn.

Wasteland
Land
Rules Text (Oracle):    
: Add 1 Mana to your mana pool.
, Sacrifice Wasteland: Destroy target nonbasic land.

Glacial Chasm
Land
Rules Text (Oracle):    
Cumulative upkeep-Pay 2 life. (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.)
When Glacial Chasm comes into play, sacrifice a land.
Creatures you control can't attack.
Prevent all damage that would be dealt to you.



Situation 1: Player A uses Wasteland's activated ability, in response player B uses Elsewhere Flask to make all his lands Mountains. Is the Wasteland's activated ability countered?

(My answer would be no, Elsewhere Flask does not make them basic lands, it just gives them a basic land type.)

Situation 2:Player B plays a Glacial Chasm then tries to sacrifice the Flask to keep the Chasm's C-I-P Ability from triggering. Does this work? Is there any way for any interaction of those 2 cards to keep Chasm's ability from triggering?

(My answer is no, Glacial Chasm comes in to play and the CIP ability is placed on the stack before anyone can turn the chasm in to a mountain/island etc. I do however believe that in a situation where a blood moon is in play, the CIP ability would never trigger since the land comes in to play as a mountain and the CIP ability triggers When and not AS Glacial Chasm comes in to play.)

[IthilanorStPete]

Situation 1: You're entirely correct.
Situation 2: You continue to be entirely correct.

[Wagner]

Edit: My bad.

[Anusien]

Basically, Elsewhere Flask doesn't change anything to the ability of a land except that it will now also be a Plains and produce White mana (or any other type you choose.

You are actually incorrect.  Elsewhere Flask will take away abilities from lands that are not of the chosen type.  The reason you can't stop Glacial Chasm with Elsewhere Flask is that when you play it, the CIP ability will go on the stack before either player gets priority.

212.6h If an effect changes 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 and its old land types, 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. Changing 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.