The effect that shuffles cards on the field into the Deck, up to the number of different original Attributes of the Wyrm monsters used for this card's Synchro Summon is a Trigger Effect that can optionally be activated. (It targets cards on the field.)[1]
The effect that destroys 1 card you control and Special Summons 1 Level 4 or lower monster in your Graveyard is an Ignition Effect. (It targets 2 cards: 1 card you control and 1 Level 4 or lower monster in your Graveyard.)[1]