According to Bulbapedia, the Japanese exclusives have around 100 copies
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You end up controlling five lands (two tapped Plains plus your original three, which you probably tapped to cast Claim Jumper in the first place)
Teyo works in more archetypes that the blue one, Vronos, since it's good in planeswalker decks with it's +1, and most other decks with it's -2, but Teyo is good in planeswalker decks too since he makes a free flyer to block attacks as well as Defenders, Toughness, Group Hug with his +1, Pillow Fort with the -2 to force attacks elsewhere save for one, Politics decks, and any white deck that wants pure card draw
Sea Gate Loremaster has a tap ability that draws cards equal to the number of allies you control
If youre dumping lands in there, theres a good chance youve got other permanents in there as well