yugioh new harpie cards negate any monster effects your opponent activates Yu-gi-oh Harpie's Feather Storm LED4-EN000

Once per turn, during the End Phase, if this card destroyed an opponent's monster by battle this turn: Special Summon 1 "Insect Monster Token" (Insect/EARTH/Level 1/ATK 100/DEF 100) in Attack Position

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Countless Gears Renegade has the new Revolt mechanic, which creates a 1/1 colorless Servo artifact creature token when Countless Gears Renegade enters the battlefield if a permanent you controlled left the battlefield this turn

Unlike mana, which you can't keep for very long if you don't spend it, energy counters stay with you turn after turn until you spend them or an effect causes you to lose them