Send any number of monsters from your side of the field to the Graveyard to activate this card. Select from your Deck 1 "Alien" monster whose Level is equal to the total Levels of the sent monsters, and Special Summon it. If you fail to find a monster to Special Summon, you take 2000 damage.
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So the cars affect state you take 2000 damage if you don't find a suitable monster, but doesn't let you sac monsters unless you have that level monster in your deck thereby avoiding the damage... Wtf. Also why can't I select ALIEN OVERLORD???
Crop Circles won't work with Alien Overlord because you can only control 1 Alien Overlord on the field. Therefore you can't activate this to summon another Overlord, even if you tribute the original Overlord.
This card only works like this in an alien deck: Send a level 4 monster to get an alien lvl 4 monster for one more attack
You can send any monster you control to the Graveyard, but their total Levels still have to equal the Level of an Alien in your Deck. (Which makes the burn effect baffling, since in most circumstances, it's impossible for it to trigger.)