Necropotence essentially, at the very low cost of 'cards that are discarded get exiled', swaps your regular draw phase for 'pay X life, draw X cards next turn'
First is the showcase Pip-Boy treatment found on 26 cardscards in this treatment can be found in non-foil, traditional foil, and surge foil within Collector Boosters
When Wurmcoil Engine returns to the battlefield, repeat the process infinitely: sacrifice Wurmcoil, stack the triggers, sacrifice a Wurm to pay the four for Nim Deathmantle, bring back the Wurmcoil Engine
All the legends in Homelands are overcosted for their effects, and honestly are quite bland regardless
It takes a lot of work to get good use out of this Diamond, but there are several tricks that allowed the mana to end up being used for spells that have no business being cast on the turn in question