Magicians Unite (SDSC-EN021 Structure Deck: Spellcaster's Command) - Common Yu-Gi-Oh! Card

Activate only while you control 2 or more face-up Attack Position Spellcaster-Type monsters; select 1 of them. That monster's ATK becomes 3000 until the end of this turn. Other Spellcaster-Type monsters you control cannot attack this turn.