This card shuts any creature down by changing it into a Forest land and removing its other types and abilities
A Jeskai Control deck with Think Twice and Serum Visions can probably get away with playing slightly fewer lands than a R/W Control deck with no card advantage or filtering (which is why the R/W Control decks plays four copies of Simian Spirit Guide)
Trade Secrets Banned in Commander, Trade Secrets could just give two players their decks plus a Reliquary Tower in hand leaving everyone else behind if your chosen opponent engages the may clause at warp factor 10
The Vault was ideal for Stasis decks and offered quality search at a time when other searching was at best severely limited
Here's a cheat on the same pattern so we can cover that Battle of Wits player: 2 6 = 64 2 7 = 128 2 8 = 256
Like Jumba, this Lilo card doesn't come with any type of ability, but she's a cost three card that can be inked and, in comparison to other cards that cost the same, she can really pack a punch with her strength of four