Needing to play against blue or black opponents is a bit restrictive, but this card punches well above its weight as a cheap, interactive 2-for-1
But outside of that, and since you can only tap for one mana not two it isn't the best option for your decks, so I wouldn't overuse it in decks with too many colors
After Yami Yugi hid his Deck Master "Dark Magician" with the effect of "Magical Hats" (a Spell Card), he announced his activation of his Deck Master's ability, and that by paying 1000 Life Points, he could use "Magical Hats" again that turn
This card has already done its job if you get even one land out of it, but its very likely that Deep Gnome Terramancer will stick around and net you multiple lands if there are green decks or color-intensive decks that might run fetchlands at the table
Kaiba only wins the duel because he manages to defy Ishizu's vision of the future and performs a move that she wasn't expecting