The name is cute, but it's going to trip a lot of people up as they build Sealed/Draft decks or cast it
Kellan also adds a unique element to this style of deck by providing a major buff to your other Creatures, incentivizing you to go wide as well as tall
If you somehow control two Delney, Streetwise Lookouts, abilities of creatures you control with power 2 or less trigger three times
As we all know by now, having a guaranteed card in your starting hand is enormous, and thats before acknowledging how strong every Companion in its own right or that Companion also provides card advantage
I built casual Sliver decks and I built competitive Sliver decks
Imagine keeping a one-lander in Counter-Cat (to follow this example, click on this link and glance over the decklist), fetching up a Steam Vents, and leading with Delver