cards like buried alive mtg - 2003 Peer Kroger (ODY) - World Championship Decks put them into your graveyard Buried Alive (Foil) - Gothic

Then the land can enter untapped with the loss of three life in case you need that mana now, totally worth it in 40 life formats

and the 8 new-to- Magic mythic rare Commander cards in extended art (9.9%)

Life gain can make for great sideboard cards against burn-heavy decks

While there's no Eternalize here, I do like that Kiora can pitch some of your excess lands for spells, while also netting you some life from a Sheoldred, the Apocalypse

However, copy effects do respect changes to those values resulting from other copy effects, face-down status, and some effects that set a creature's power or toughness

Well, that Roil Elemental can be ours just by tapping Adarkar Valkyrie