You can only use each effect of 'Evilswarm Kerykeion' once per turn. While this card is in the Graveyard, if it was sent there this turn, you can Normal Summon 1 'lswarm' monster for 1 less Tribute.
You can banish 1 'lswarm' monster from your Graveyard, then target 1 'lswarm' monster in your Graveyard; add that target to your hand, also, this card gains the following effect.
● This turn: You can activate this effect; Normal Summon 1 'lswarm' monster.