Forum:Number 24: Dragulas the Vampiric Dragon - Phrasing question

Hi, I feel like this is the best suited forum for this question as it isnt really a ruling. Regarding part of Number 24's effect "If this face-up card in its owner's control is sent to your Graveyard or banished by your opponent's card effect: You can Special Summon this card" I wanted to clarify the phrasing of it.

Is it; if this card is sent to: graveyard/banish by opponent card effect only, then SS.

Or; if this card is sent to the graveyard. Or banished by card effect, where sending the monster to the graveyard by battle (no effect) allows for Number 24 to SS himself.

Thanks