Za Haen, Mercurial Artisan

When Za Haen enters the battlefield, create X
Mercury tokens. (It's an artifact with "{4}, {t}, sacrifice this artifact: Proliferate.")
Whenever a land enters the battlefield under
your control you may choose a permanent or
player with a counter on it. Put another counter
of the same kind on target permanent or player.
He learned the Phyrexians' secrets, only to use their
power against them.