Extra normal summon can speed up the process of tribute summoning to get higher level monsters out or summon more monsters to direct attack.
It can leave you with few cards left in hand, letting your opponent know you don't have much left.
Tips, related cards, skills
This can be used to get some OTK potential by summoning more monsters quickly.
In a daedalus deck, you can use double summon to summon a monster and use Big Wave Small Wave to get daedalus out and use his effect. Summon another monster and finish your opponent. Though this requires 5 cards and need to not get stopped by Sphere Kuriboh.
Using Gale Lizard or Hane-Hane, when your opponent only has 1 monster in the early turns of the duel, you can clear his monster field and use double summon to end the duel early.
Don't fall for the hype behind this card. It's goddamn awful. There's a reason this card has always been vendor trash in the RL game. It's a winmoar card that's guaranteed to over you multiple times and only works with already decent hands.
I use this card alongside Feast of the Wild and The A Forces with Ice Barrier monsters.
I use it to farm Auto-Duel L45, barely lose, have a couple support spell cards to help knockout any Blue Eyes or Meteor B Dragons if they're pulled out earlier. Can get anywhere from 2K-4K assessment.
This card can be bad in the wrong deck but half the Ice Barrier normal summons allow you to draw a card to help keep your hand topped up and it helps get the 2 tribute IB monster out who can summon IB from the GY. Add in A Forces and double summoning L5 Warriors from your hand with FotW.
I use the SR 2300atk warrior who can pull low level warriors from the deck. Which is an 1800atk IB warrior who can be sacrificed by changing to defence position and draw 1 card as well as boosting itself and other warriors (L5s) with A Forces on the field.
Run Yugi's Power of Dark skill and you boost the other half of the IB monsters in the deck, 1700 to 1900 and 1600 to 1800.
I'd post names and a screenshot but maintenance is running, I'll do it later on.
It gives you one extra normal summon,tribute summoning and setting both count as normal summon so theoretically you could normal summon a monster then tribute that monster for a tribute summon with this card or you could summon one monster and set another, whatever floats your boat though
So you can't use it then put out a 1 sacrifice monster without a sacrifice?