mtg omen cards TR&CI 173: Omens & Harmonize you may search your library for a basic land card Omen Dragons Are RIDICULOUS |

Image via Wizards of the Coast LLC Nahiri, the Unforgiving Here is another excellent planeswalker that may cost you no more than 3 mana for 3 points of loyalty that will go straight into the Mardu Midrange deck with Bloodtithe Harvester

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If you have a combo, look for a time to execute it when the potential for interruption is low to nonexistent

Being able to give your spirit creatures double strike without building up extra loyalty points seems quite aggressive as well