Card Rulings:Kataria, Spark Queen of Evil Vine


 * "When this card is Synchro Summoned: Take 2000 Life Points damage" This effect is Trigger, and happens only when it is Synchro Summoned.
 * If there's a face-up Prime Material Dragon, you gain LP instead.
 * The effect of " During either player's turn, when a Spell, Trap, or an Effect Monster card would Destroy or negate the activation of "Vine" monster: You can negate the activation, and if you do, destroy that card, if this effect resolved and is not negated: Gain Life Points Equal to this card's ATK." cannot activate in a response to The Fabled Unicore since it's a continuous effect, it doesn't trigger and it can't be chained.
 * If this card is Special Summoned, then you activate The Seal of Orichalcos, The effect of " During either player's turn, when a Spell, Trap, or an Effect Monster card would Destroy or negate the activation of "Vine" monster: You can negate the activation, and if you do, destroy that card, if this effect resolved and is not negated: Gain Life Points Equal to this card's ATK." will activate in a response to that card's activation, negate it, then gain ATK as LP, The Seal of Orichalcos is just sent to the Graveyard afterwards.
 * It also activates in a response to Fiendish Chain and negate is effect.
 * However, it cannot chain Breakthrough Skill or Divine Wrath, thus all of its effects are negated.