Rarity, Gem Hunter

Vigilence, Hexproof
{3}: Search your library for a mana-rock with converted mana cost 2 or less, put it on
to your battlefield.
(mana-rocks are any mana producing artifacts)
{t}: Give control of target mana-rock you control
to another player.
Rarity, Gem Hunter gets +4/+4 and gains
"{t}: add {w}{u}{b}{r}{g} to your mana pool." while
other players control six or more mana-rocks.