Imperial Seal and Vampiric Tutor Pay 1 mana (and 2 life), put any card in your deck on top of your library
Played in moderation in Modern, Legacy, and Vintage, Cavern of Souls definitely has its fans in competitive formats
These lands dont have to be basic lands either, they can be practically anything in your deck
They might turn a small creature into a big evasive threat, give hexproof to dodge removal, or even transform a creature into something completely different like a dragon or serpent
Shrine of Burning Rage is just so metal
Finally, the prize card given only to tournament winners is a unique copy of Dark Ritual, with great colorful artwork and a character that looks like they come from Adventure Time (I wonder if that would work as a Universes Beyond SL)