Mars, Home to Possible Life

At the beginning of your combat main phase roll a
20-sided die.
18-20: create 4 2/2 aliens tapped and attacking.
12-17: Create 2 2/2 aliens tapped and attacking.
10-12: If Earth is on the battlefield, then create
a 4/4 human
1-9: search your library for a basic land card and put
it into your hand