Magicians Unite

Normal Spell

If you control 2 or more Attack Position Spellcaster monsters: Target 1 of them; its ATK becomes 3000 until the end of this turn, also for the rest of this turn after this card resolves, other Spellcaster monsters you control cannot attack.

Rulings – Yugipedia

Printings:

Champion Pack: Game Three: CP03-EN001 (Ultra Rare) - 2007-05-15
Spellcaster's Command Structure Deck: SDSC-EN021 (Common) - 2009-03-31
Turbo Pack: Booster Eight: TU08-EN009 (Rare) - 2012-06-01
Legendary Collection 3: Yugi's World Mega Pack: LCYW-EN077 (Common) - 2012-09-29
Starter Deck: Yugi Reloaded: YSYR-EN035 (Common) - 2013-12-06
Battle Pack 3: Monster League: BP03-EN152 (Common) - 2014-07-31
Battle Pack 3: Monster League: BP03-EN152 (Shatterfoil Rare) - 2014-07-31
Yugi's Legendary Decks: YGLD-ENC30 (Common) - 2015-11-12
Legendary Decks II: LDK2-ENY25 (Common) - 2016-10-06
Speed Duel: Arena of Lost Souls: SBLS-EN009 (Common) - 2019-03-28

Prices:

Cardmarket: 0.06 €
TCGplayer: $ 0.08