Requires you to banish spell/trap cards equal to the level of the monster you want to special summon.
Cards banished face-down are very hard to interact with.
There is no “once per turn” on the effect, meaning you can special summon any number of monsters from your deck as long as you have enough spell/trap cards. You can swarm the field by special summoning multiple level 1 normal monster, which can then be used to special summon monsters like The Atmosphere or Destiny HERO - Plasma. Special summon a Spellcaster-type to tribute it into special summoning Silent Magician. Or can be used as tributed to tribute summon a high-leveled monster.