You know what would be really cool?
Water / 8 / Warrior / Synchro / 2800 / 2600
1 Tuner + 1 or more non-Tuner monsters
If this card destroys an opponent's monster by battle and sends it to the Graveyard: Your opponent cannot Normal or Special Summon Level 4 or lower monsters during their next turn.
Make it happen, Konami! Lol but maybe not really, because this would be pretty damn strong.