It can also make combat a nightmare for opponents, since theyll never know what tricks I might have up my sleeve
There could be a world where Stoneforge Mystic snagging Umezawa's Jitte drives creature decks out of the format and necessitates a rebanning, but we won't know until we try, and with our return to Kamigawa this winter, the time to unleash Jitte into Modern is now
Can I get lands with my Gonti, Lord of Luxurys triggered ability
Here are some examples how the cards look like

Scyther #87 (Shiny/ One Rainbow Star) Pineco #88 (Shiny/ One Rainbow Star) Phantump #89 (Shiny/ One Rainbow Star) Trevanant #90 (Shiny/ One Rainbow Star) Charmander #91 (Shiny/ One Rainbow Star) Charmeleon #92 (Shiny/ One Rainbow Star) Ponyta #93 (Shiny/ One Rainbow Star) Rapidash #94 (Shiny/ One Rainbow Star) Slowpoke #95 (Shiny/ One Rainbow Star) Pikachu #96 (Shiny/ One Rainbow Star) Raichu #97 (Shiny/ One Rainbow Star) Electrike #98 (Shiny/ One Rainbow Star) Hawlucha #99 (Shiny/ One Rainbow Star) Gastly #100 (Shiny/ One Rainbow Star) Haunter #101 (Shiny/ One Rainbow Star) Zorua #102 (Shiny/ One Rainbow Star) Zoroark #103 (Shiny/ One Rainbow Star) Forretress #104 (Shiny/ One Rainbow Star) Dratini #105 (Shiny/ One Rainbow Star) Dragonair #106 (Shiny/ One Rainbow Star) Dragonite #107 (Shiny/ One Rainbow Star) Axew #108 (Shiny/ One Rainbow Star) Fraxure #109 (Shiny/ One Rainbow Star) Haxorus #110 (Shiny/ One Rainbow Star) Rewards: 36 Wonder Hourglasses, 12 Pack Hourglasses and 10 Shop Tickets

Consequently, Thoughtseize is quite poor against a deck with a lot of redundancy