Its preferred targets are ones with strong ETBs or death triggers, like Protean Hulk and Worldspine Wurm
Its highly advised to check with the Head Judge about your deck prior to the start of a match
More importantly, this effect wont be destroying your own creatures
[8] The five basic lands are as follows: White lands, or Plains, which produce white mana Blue lands, or Islands, which produce blue mana Black lands, or Swamps, which produce black mana Red lands, or Mountains, which produce red mana Green lands, or Forests, which produce green mana There are also different kinds of lands (dual-lands and tri-lands, for example), but the most a beginner needs to know is that basic lands produce mana of one color only, and that multicolor lands can produce mana of two or more colors
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