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Rulings
Once you announce that you're casting a spell, players can't attempt to remove Shimmer Myr from the battlefield to make that casting illegal. Removing Shimmer My after you've cast a spell won't affect that spell.
Shimmer Myr has no effect on artifact lands because they aren't cast as spells.
Shimmer Myr has no effect on artifact lands because they aren't cast as spells.
Rulings
Once you announce that you're casting a spell, players can't attempt to remove Shimmer Myr from the battlefield to make that casting illegal. Removing Shimmer My after you've cast a spell won't affect that spell.
Shimmer Myr has no effect on artifact lands because they aren't cast as spells.
Shimmer Myr has no effect on artifact lands because they aren't cast as spells.
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