Worm Xex and Worm Yagan combo with each other. Xex pitches Yagan to the graveyard, Yagan will then revive itself and protect Xex. Add W Nebula Meteorite to this combo for some draw power and to make use of Yagan’s bouncing effect.
Here are some of the monsters you can pitch to the graveyard.
Send Worm monsters you want to revive to your graveyard. The Shallow Grave is good for Worm decks because placing them face-down sets them up to use flip effects. Viper Rebirth can be used to revive Worm Queen which will summon another Worm monster from your deck