Outpost Traders

Hexproof
Whenever Outpost Trader attacks, if the
defending player controls a non-basic land, that
player exiles the top card of their library.
Until end of turn, you may play that card, and
you can spend mana as though it were mana of
any color to cast that spell. If you do, that player creates three Treasure tokens and gains control
of Outpost Trader.