A creature with a defense of 4 can withstand 3 points of damage in combat without dying
Getting Tri-Brigade Shuriag the Ominous Omen and Accesscode Talker onto the field is your win condition for this deck
Delver of Secrets remains a favorite archetype in the high-powered Legacy format, and its flipside, Insectile Aberration, is shown here as the upgraded Docent, and then, ultimately, the Final Iteration, completing the Delvers transformation from devious Wizard to all-consuming Insect god
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Thanks for reading, and happy hunting
Alternatively, you can aim for blink effects and recursion/reanimation to grab them out of your graveyard instead