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One of the first supplements to help out the Tearlaments is Kashtira --lead by the card connecting the two archetypes together, Tearlaments Kashtira

Finally, you have World Legacy - "World Chalice" who can tribute itself when a monster is Special Summoned from the Extra Deck to send said monster to the graveyard, summons 2 World Chalice monsters from your Deck when it is sent from the field to the graveyard if it was Normal Summoned or Set, and can banish itself from the graveyard any other turn it wasn't sent there to search for any World Legacy card from your Deck

But how do you get cards

The boss monster of the archetype, Geomathmech Final Sigma, is incredibly powerful too and does double damage if its summoned in the extra monster zone