As an additional cost to cast this spell, sacrifice a green creature.
Search your library for a green creature card, put it onto the battlefield, then shuffle.
Mana cost
2
G
G
Mana value
4
Printings
From
$14.56
EDHREC rank
#1540
Game changer
Counts toward a deck's bracket
Buy
Formats
Legacy
Legal
Vintage
Legal
Commander
Legal
Brawl
Banned
Duel
Banned
Gladiator
Banned
Historic
Banned
Oathbreaker
Banned
Rulings
8 Jun 2016
Sacrificing a green creature is part of Natural Order's cost. You can't sacrifice more creatures to search for more creature cards, and you can't cast Natural Order at all if you control no green creatures.
8 Jun 2016
Players can respond to this spell only after it's been cast and all its costs have been paid. No one can try to destroy the creature you sacrificed to stop you from casting this spell or to make you sacrifice a different one.