Spell Card -You can only activate this card when there are 3 Normal Monsters of the same name (except Tokens) on your side of the field. The 3 Normal Monsters of the same name can attack your opponent's Life Points directly during the turn this card is activated.
Here's a card I've been contemplating, it's got quite a nifty effect, allowing 3 direct attacks to your opponent's life points.
It's got draw backs, first it doesn't work on effect monsters, so you can't use monsters with effects that would easily get three out, or allow for multiple attacks, or something like that
And you need three of the same monster, which isn't easily done (especialy if you want to use 3 Blue-Eyes White Dragons)
Though there are some fun combos to go with it, first of all, there's Ultimate Offering which can help you get 3 of the same normal monster out, as long as it's worth the thousand life points (if you can use Ultimate Offering for 2 extra summons in one turn, that is)
Then there's Mokey Mokey King! when he dies, he summons three Mokey Mokeys! Combine that with Triangle Power (and possibly Mokey Mokey Smack Down) for 3 2300 direct attacks! (6900)
If they ever release Blue-Eyes Ultimate Dragon, you can use De-Fusion on it to bring 3 Blue-Eyes to the field, which would be a 9000 direct attack!
Agent of Creation - Venus can get 3 Mystical Shine Balls out in 1 turn, but being level 2, they can't use Triangle Power, and only result in a 1500 direct attack
In the end, a deck based on Delta Attacker could be very fun, but it's not the most reliable card ever, the normal way, you have to wait at least 3 turns, and alot could happen to your monsters in that time