Gizmek Uka, the Festive Fox of Fecundity (Secret Rare) [ETCO-EN031-SeR]

Each time your opponent Normal or Special Summons a monster(s): Inflict 300 damage to them. You can only use each of the following effects of "Gizmek Uka, the Festive Fox of Fecundity" once per turn.
• If a monster(s) is Special Summoned from the Main Deck (except during the Damage Step): You can Special Summon this card from your hand.
• If this card is Normal or Special Summoned: You can target 1 face-up monster your opponent controls; Special Summon 1 monster from your hand or Deck whose ATK equals its own DEF, with a same Attribute as that monster.