According to the translation offered by Bulbapedia, the ability "mortal shuriken" allows Greninja's controller to discard a water energy from their hand, once per turn, to deal sixty damage to any of their opponent's Pokmon
This protects it from hand disruption like discard effects, but can help it blend in with other foretold cards to make it impossible to see coming
(3) If this card is destroyed by your opponent: You can target 1 Dragon monster in your GY
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But Kaervek's Torch was the first spell to pack what would become the formula for the unnamed, lets call it proto-ward mechanic for years to follow: Spells that target it cost more to cast. This effect was introduced on a permanent in Planechase 2012 with Elderwood Scion, and the costing--more-to-cast formula generally appeared on one card per set (with plenty of exceptions) starting with Dragons of Tarkir s Icefall Regent