When Marina Vendrell's Grimoire enters the battlefield, its first ability triggers, causing you to draw five cards.
Starving Revenant's second ability triggers five times.
Resolve the first Starving Revenant trigger, causing you to gain 1 life and an opponent to lose 1 life.
Marina Vendrell's Grimoire's second ability triggers, causing you to draw a card.
Starving Revenant's second ability triggers, causing you to gain 1 life and an opponent to lose 1 life.
Repeat from step 5.
This ingenious loop turns life gain into an endless cascade of card draw, fueled by the passive lifelink-like synergies hidden in the graveyard. Once Marina Vendrell's Grimoire is safely on the battlefield, its protective clause ensures you don't instantly lose to zero or less life while its main trigger nets you an initial handful of cards. Meanwhile, Starving Revenant looks for those exact moments of card draw once your graveyard hits the descend 8 threshold, draining your opponent while granting you precious life. That newly gained life immediately loops back into Marina Vendrell's Grimoire to draw yet another card, feeding Starving Revenant's descendant ability in an unstoppable, self-sustaining loop.