Varragoth, Bloodsky Sire The best thing you can do with Varragoth, Bloodsky Sire is to set up your future draws via the boast mechanic
It also has a Shift cost of three, Resist +1, and Support
Cards in library and graveyards also have some effect on both games and are certainly a kind of resource

Labs Aang's Journey Aang, Master of Elements Aardvark Sloth Abattoir Ghoul Abiding Grace Absolving Lammasu Absorb Absorb Vis Abuna's Chant Abundant Maw Acolyte of Aclazotz Act of Aggression Adorable Kitten Adventurer's Inn Adventurous Eater Aerial Assault Aerial Responder Aerith Gainsborough Aetherflux Reservoir Agate-Blade Assassin Agent of Masks Agonizing Syphon Airdrop Aeronauts Ajani Goldmane Ajani Vengeant Ajani's Mantra Ajani's Pridemate Ajani's Sunstriker Ajani's Welcome Ajani, Inspiring Leader Ajani, Strength of the Pride Ajani, Wise Counselor Akoum Refuge Al Bhed Salvagers Alabaster Mage Alchemist's Gift Alhammarret's Archive Alive // Well Alley Assailant Alms of the Vein Alquist Proft, Master Sleuth Altar of the Pantheon Amalia Benavides Aguirre Amateur Hero Amazing Alliance Ancestor Dragon Ancestor's Chosen Ancestor's Prophet Ancestral Tribute Anchovy & Banana Pizza Angel of Destiny Angel of Mercy Angel of Renewal Angel of Vitality Angel's Feather Angel's Mercy Angelheart Vial Angelic Chorus Angrath, the Flame-Chained Animal Boneyard Anje, Maid of Dishonor Anodet Lurker Anointed Chorister Anointer Priest Answered Prayers Apothecary Geist Apothecary Initiate Apothecary White Approach of the Second Sun Arabella, Abandoned Doll Arashin Cleric

Feel free to choose any letter you want