Given that the monster is a three-headed dog, it was likely meant to also evoke Cerberus, the three-headed hound that guards the gates of the underworld in Greek mythology
Even if you send it with "Delta", it is excellent because you can gain advantage with one removal and one play
The universal dilemma of the Infiltrator was that few decks that played it wanted to tap out to get him there, but sticking him on the board was so devastating that most opponents would consider themselves fortunate to spend that window of opportunity making him go away as trying to race him with a traditional three- or four-drop was pure folly and playing your own blocker, including your own Shadowmage or something a little bulkier risked a removal spell that would lead into a downward spiral of card disadvantage
Igknight Crusader X FIRE Level 3 [ WarriorPendulumNormal ] ATK 1600 DEF 300 P Scale 2 If you have an "Igknight" card in your other Pendulum Zone: You can destroy both cards in your Pendulum Zones, and if you do, add 1 FIRE Warrior-Type monster from your Deck or Graveyard to your hand
The ability on this card neatly ties both themes of the deck together by having a will of the council ability that triggers if an elf entered your battlefield that turn