Fidix, Poison Of The Cosmos

Flying, trample, infect
Cosmic (At the beginning of your endstep. As long as
you control ten or more lands, you may have this
creature become an enchantment with indestructible
and shroud until your next turn. It is not a creature)
Whenever Fidix deals damage to a player, you
reveal the top X cards of your library, you may
put any number of lands revealed this way into
the battlefield. Shuffle your library.