Im thankful Ive never been in this position, but I know at least two people who have funded major emergencies in their lives by offloading Magic cards
Creature - Cleric Elf Titan of Littjara As this creature enters, choose a creature type
It can be used for all of the same sorts of plays, but rather than adding mana, it can trigger lifegain, which can put you over the threshold for some effects, or just trigger putting +1/+1 counters on things
Cards that repeatedly ping your opponents like Creeping Bloodsucker, Stormfist Crusader, and Descent into Avernus play well here
Coupled with ways to get extra Treasure and the right assortment of legendary creatures, its perfectly viable, though
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