Atheris, Spirit of the Diamond

As an additional cost to cast Atheris, sacrifice an artifact named Diamond of Syfria.
Trample, menace
All lands are 1/1 Golem creatures. They're still
lands. Land creatures you control get +2/+2 and
have menace.
"The stone of this world made perfect slaves, I wonder
what use I can find for the rest of it."