When this face-up card on the field is sent to the GY: You can target 1 of your banished Dragon monsters
This is primarily due to the Oculus' playability in both Modern and Legacy, where it's incredibly easy to get six cards into your graveyard, or to reanimate the Oculus with a simple Unearth
Special shoutout to Flickering Ward, a really cool Enchantress tech card that bounces itself to hand, which lets you repeatedly trigger Killian
Furthermore, the high amount of energy required to use its attack raises the risk of the player's Pokmon being knocked out before it can be utilized
This is a yugioh deck that I call Sylvan/Ragnaraika
The themes and mechanics of the deck are also a lot of fun to play with and mesh very well, with transforming cards, double-sided cards, token generation, graveyard nullification, card draw, and much more