Lets say you have a level 5 or 6 monster in your hand and a monster on the field you played on your last turn, you can summon that monster by sacrificing your weaker monster to the card graveyard
ATK, then if they do not, or if the target has more ATK than that chosen monster, Special Summon the target to your field, also shuffle the chosen monster into the deck

Yugioh-Card database #14514 ja - rulings en fr de it pt es ko Gallery Rulings Errata Artworks Tips Trivia Appearances TCG sets English Worldwide English Release Number Set Rarity 2019-07-25 RIRA-EN066 Rising Rampage Common French French Release Number Set French name Rarity 2019-07-25 RIRA-FR066 Rising Rampage Le Soulvement de la Fureur Common German German Release Number Set German name Rarity 2019-07-25 RIRA-DE066 Rising Rampage Rising Rampage Common Italian Italian Release Number Set Italian name Rarity 2019-07-25 RIRA-IT066 Rising Rampage Furia Crescente Common Portuguese Portuguese Release Number Set Portuguese name Rarity 2019-07-25 RIRA-PT066 Rising Rampage Investida Crescente Common Spanish Spanish Release Number Set Spanish name Rarity 2019-07-25 RIRA-SP066 Rising Rampage Alzamiento de la Devastacin Common OCG sets Japanese Japanese Release Number Set Japanese name Rarity 2019-04-13 RIRA-JP066 Rising Rampage Normal Rare Korean Korean Release Number Set Korean name Rarity 2019-07-09 RIRA-KR066 Rising Rampage Normal Rare Search categories Supports Ritual Monster Fusion Monster Synchro Monster Xyz Monster Pendulum Monster Link Monster Summoning categories Special Summons from your Deck Special Summons from your Extra Deck Banished categories Banishes from your hand Banishes from your field Banishes from your Graveyard Miscellaneous Only once per turn Other languages Language Name Card text French Invocation Sextet Bannissez 6 monstres (1 Rituel, 1 Fusion, 1 Synchro, 1 Xyz, 1 Pendule et 1 Lien) du mme Type d'origine depuis votre main, Cimetire, et/ou Terrain face recto, puis Invoquez Spcialement 1 monstre depuis votre Deck ou Extra Deck, du mme Type d'origine que ces monstres bannis

There are some pretty weak ones as well like Test of Endurance which seemed too deep and bad
How much does Summon: Choco/Mog cost
Breath Weapon is crucial to shut down those pesky elf and goblin decks, and it can squeeze that last bit of damage you need to remove your opponents big creatures after an unsuccessful combat phase