Former MOCS winner Jacksad knows a thing or two about Show and Tell, and a few weeks ago he cooked up a brand-new version of the deck. At Grand Prix Kyoto, many of the Japanese players had an Omni-Tell variant that took advantage of a red splash for Young Pyromancer out of the sideboard.
Jacksad decided to splice those into the maindeck, which also allowed him to take advantage of a Gitaxian Probe + Cabal Therapy package. Young Pyromancer might seem out of place, but the deck was already trying to cast a bunch of spells and Young Pyromancer certainly benefits from that. Being able to add Cabal Therapy to your combo deck is just icing.
The other things I like about Jacksad’s deck are Boseiju, Who Shelters All, Burning Wish, and the use of Griselbrand and Emrakul, the Aeons Torn on top of Omniscience. Boseiju tends to be quite good against Miracles, while Burning Wish effectively gives you more copies of Show and Tell. Most Omni-Tell decks these days don’t run Griselbrand, but with additional Show and Tells, it’s nice to have multiple combo pieces.
This may not be the final form of Omni-Tell, but it’s clear that there’s more to be done with this archetype than just assembling your combo in the most efficient way possible.