Level Eater 
100
Level 1 DARK/Insect Effect600 ATK / 0 DEF
If this card is in your Graveyard: You can target 1 Level 5 or higher monster you control; reduce its Level by 1, and if you do, Special Summon this card. This face-up card on the field cannot be Tributed, except for a Tribute Summon.
Printings:
Stardust Overdrive: SOVR-EN005 (Common) - 2009-11-17Duelist Pack: Yusei 2: DP09-EN011 (Common) - 2010-01-15
Duelist Pack Collection Tin 2010: DPCT-ENY07 (Super Rare) - 2010-03-05
Duel Terminal 5a: DT05-EN005 (Duel Terminal Normal Parallel Rare) - 2011-05-29
Battle Pack: Epic Dawn: BP01-EN209 (Common) - 2012-05-24
Battle Pack: Epic Dawn: BP01-EN209 (Starfoil Rare) - 2012-05-24
Legendary Collection 5D's Mega Pack: LC5D-EN014 (Rare) - 2014-10-23
Synchron Extreme Structure Deck: SDSE-EN017 (Common) - 2015-08-27
Emperor of Darkness Structure Deck: SR01-EN020 (Common) - 2016-01-28
Prices:
Cardmarket: 0.09 €TCGplayer: $ 0.13