Flying

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Scorch-Maw gets +1/+1 for each basic mountain you control.

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Whenever Scorch-Maw attacks, choose a land you control that is not a basic mountain. The chosen land loses all types and subtypes and becomes a basic mountain. If you control only basic mountains, then you may sacrifice a land you control. If you don't, Scorch-Maw deals 5 damage to you.