Defender, the Magical Knight

Level 4 LIGHT/Spellcaster Effect Monster
1600 ATK / 2000 DEF

If this card is Normal Summoned: Place 1 Spell Counter on it (max. 1). Once per turn, if a Spellcaster monster(s) on the field would be destroyed, you can remove 1 Spell Counter from your field for each of those monsters instead.

Rulings – Yugipedia

Printings:

Spellcaster's Command Structure Deck: SDSC-EN003 (Common) - 2009-03-31
Duelist League 14 participation cards: DL14-EN006 (Rare) - 2012-06-01
Battle Pack 3: Monster League: BP03-EN054 (Common) - 2014-07-31
Battle Pack 3: Monster League: BP03-EN054 (Shatterfoil Rare) - 2014-07-31
Structure Deck: Order of the Spellcasters: SR08-EN007 (Common) - 2019-04-19

Prices:

Cardmarket: 0.21 €
TCGplayer: $ 0.34