Oppenheimer, Griefer

+3: Activate this ability only if you sacrificed a Landmine last turn and a creature dealt damage by that mine died that turn. Draw a card.
+1: Create a colorless artifact token named "Landmine" with "Sacrifice this artifact: Landmine deals 2 damage to target attacking creature"
-8: Create a colorless artifact token named "TNT" with "Sacrifice this artifact: Destroy up to two target permanents"